[转] vue父组件触发子组件事件
<p>1. 父组件中获取子组件方法</p><ul>
<li>$children</li>
</ul>
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<div class="container">
<div class="line number1 index0 alt2"><code class="javascript plain"><template></code></div>
<div class="line number2 index1 alt1"><code class="javascript spaces"> </code><code class="javascript plain"><div></code></div>
<div class="line number3 index2 alt2"><code class="javascript spaces"> </code><code class="javascript plain"><v-header></v-header></code></div>
<div class="line number4 index3 alt1"><code class="javascript spaces"> </code><code class="javascript plain"><v-content></v-content></code></div>
<div class="line number5 index4 alt2"><code class="javascript spaces"> </code><code class="javascript plain"><v-footer></v-footer></code></div>
<div class="line number6 index5 alt1"><code class="javascript spaces"> </code><code class="javascript plain"></div></code></div>
<div class="line number7 index6 alt2"><code class="javascript plain"></template></code></div>
<div class="line number8 index7 alt1"><code class="javascript plain"><script></code></div>
<div class="line number9 index8 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">import</code> <code class="javascript plain">vHeader from </code><code class="javascript string">'./Header'</code><code class="javascript plain">;</code></div>
<div class="line number10 index9 alt1"><code class="javascript spaces"> </code><code class="javascript keyword">import</code> <code class="javascript plain">vContent from </code><code class="javascript string">'./Content'</code><code class="javascript plain">;</code></div>
<div class="line number11 index10 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">import</code> <code class="javascript plain">vFooter from </code><code class="javascript string">'./Footer'</code><code class="javascript plain">;</code></div>
<div class="line number12 index11 alt1"> </div>
<div class="line number13 index12 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">export</code> <code class="javascript keyword">default</code> <code class="javascript plain">{</code></div>
<div class="line number14 index13 alt1"><code class="javascript spaces"> </code><code class="javascript plain">components:{vHeader,vContent,vFooter},</code></div>
<div class="line number15 index14 alt2"><code class="javascript spaces"> </code><code class="javascript plain">created(){</code></div>
<div class="line number16 index15 alt1"><code class="javascript spaces"> </code><code class="javascript plain">console.log(</code><code class="javascript keyword">this</code><code class="javascript plain">.$children)</code></div>
<div class="line number17 index16 alt2"><code class="javascript spaces"> </code><code class="javascript comments">//输出结果,此时可以通过下标获取响应组件，如获取vHeader为this.$children.</code></div>
<div class="line number18 index17 alt1"><code class="javascript spaces"> </code><code class="javascript plain">}</code></div>
<div class="line number19 index18 alt2"><code class="javascript spaces"> </code><code class="javascript plain">}</code></div>
<div class="line number20 index19 alt1"><code class="javascript plain"></script></code></div>
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<ul>
<li>$refs</li>
</ul>
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<div class="container">
<div class="line number1 index0 alt2"><code class="javascript plain"><template></code></div>
<div class="line number2 index1 alt1"><code class="javascript spaces"> </code><code class="javascript plain"><div></code></div>
<div class="line number3 index2 alt2"><code class="javascript spaces"> </code><code class="javascript plain"><v-header ref=</code><code class="javascript string">'header'</code><code class="javascript plain">></v-header></code></div>
<div class="line number4 index3 alt1"><code class="javascript spaces"> </code><code class="javascript plain"><v-content ref=</code><code class="javascript string">'content'</code><code class="javascript plain">></v-content></code></div>
<div class="line number5 index4 alt2"><code class="javascript spaces"> </code><code class="javascript plain"><v-footer ref=</code><code class="javascript string">'footer'</code><code class="javascript plain">></v-footer></code></div>
<div class="line number6 index5 alt1"><code class="javascript spaces"> </code><code class="javascript plain"></div></code></div>
<div class="line number7 index6 alt2"><code class="javascript plain"></template></code></div>
<div class="line number8 index7 alt1"><code class="javascript plain"><script></code></div>
<div class="line number9 index8 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">import</code> <code class="javascript plain">vHeader from </code><code class="javascript string">'./Header'</code><code class="javascript plain">;</code></div>
<div class="line number10 index9 alt1"><code class="javascript spaces"> </code><code class="javascript keyword">import</code> <code class="javascript plain">vContent from </code><code class="javascript string">'./Content'</code><code class="javascript plain">;</code></div>
<div class="line number11 index10 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">import</code> <code class="javascript plain">vFooter from </code><code class="javascript string">'./Footer'</code><code class="javascript plain">;</code></div>
<div class="line number12 index11 alt1"> </div>
<div class="line number13 index12 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">export</code> <code class="javascript keyword">default</code> <code class="javascript plain">{</code></div>
<div class="line number14 index13 alt1"><code class="javascript spaces"> </code><code class="javascript plain">components:{vHeader,vContent,vFooter},</code></div>
<div class="line number15 index14 alt2"><code class="javascript spaces"> </code><code class="javascript plain">created(){</code></div>
<div class="line number16 index15 alt1"><code class="javascript spaces"> </code><code class="javascript plain">console.log(</code><code class="javascript keyword">this</code><code class="javascript plain">.$refs);</code></div>
<div class="line number17 index16 alt2"><code class="javascript spaces"> </code><code class="javascript comments">//输出结果：{header:VueComponent,content:VueComponent,footer:VueComponent},此时可以通过对象key进行获取响应组件，如vHeader组件获取为this.$refs.header</code></div>
<div class="line number18 index17 alt1"><code class="javascript spaces"> </code><code class="javascript plain">}</code></div>
<div class="line number19 index18 alt2"><code class="javascript spaces"> </code><code class="javascript plain">}</code></div>
<div class="line number20 index19 alt1"><code class="javascript plain"></script></code></div>
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<p>2. 子组件中定义父组件所要触发事件</p>
<ul>
<li>methods直接定义</li>
</ul>
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<div class="container">
<div class="line number1 index0 alt2"><code class="javascript plain"><script></code></div>
<div class="line number2 index1 alt1"><code class="javascript spaces"> </code><code class="javascript keyword">export</code> <code class="javascript keyword">default</code> <code class="javascript plain">{</code></div>
<div class="line number3 index2 alt2"><code class="javascript spaces"> </code><code class="javascript plain">methods:{</code></div>
<div class="line number4 index3 alt1"><code class="javascript spaces"> </code><code class="javascript plain">childAction(val=</code><code class="javascript string">'hello world'</code><code class="javascript plain">){</code></div>
<div class="line number5 index4 alt2"><code class="javascript spaces"> </code><code class="javascript plain">console.log(val)</code></div>
<div class="line number6 index5 alt1"><code class="javascript spaces"> </code><code class="javascript plain">}</code></div>
<div class="line number7 index6 alt2"><code class="javascript spaces"> </code><code class="javascript comments">//此时在父组件，可以通过获取相应子组件，使用对象key值childAction对其进行调用,当前函数形参非必须</code></div>
<div class="line number8 index7 alt1"><code class="javascript spaces"> </code><code class="javascript plain">}</code></div>
<div class="line number9 index8 alt2"><code class="javascript spaces"> </code><code class="javascript plain">}</code></div>
<div class="line number10 index9 alt1"><code class="javascript plain"></script></code></div>
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<ul>
<li>$on</li>
</ul>
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<div class="container">
<div class="line number1 index0 alt2"><code class="javascript plain"><script></code></div>
<div class="line number2 index1 alt1"><code class="javascript spaces"> </code><code class="javascript keyword">export</code> <code class="javascript keyword">default</code> <code class="javascript plain">{</code></div>
<div class="line number3 index2 alt2"><code class="javascript spaces"> </code><code class="javascript plain">mounted(){</code></div>
<div class="line number4 index3 alt1"><code class="javascript spaces"> </code><code class="javascript keyword">this</code><code class="javascript plain">.$on(</code><code class="javascript string">'bridge'</code><code class="javascript plain">,(val)=>{</code></div>
<div class="line number5 index4 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">this</code><code class="javascript plain">.childAction(val);</code></div>
<div class="line number6 index5 alt1"><code class="javascript spaces"> </code><code class="javascript plain">});</code></div>
<div class="line number7 index6 alt2"><code class="javascript spaces"> </code><code class="javascript comments">///此时通过$on进行监听中间桥接函数bridge对目的方法childAction进行触发</code></div>
<div class="line number8 index7 alt1"><code class="javascript spaces"> </code><code class="javascript plain">},</code></div>
<div class="line number9 index8 alt2"><code class="javascript spaces"> </code><code class="javascript plain">methods:{</code></div>
<div class="line number10 index9 alt1"><code class="javascript spaces"> </code><code class="javascript plain">childAction(val=</code><code class="javascript string">'hello world'</code><code class="javascript plain">){</code></div>
<div class="line number11 index10 alt2"><code class="javascript spaces"> </code><code class="javascript plain">console.log(val)</code></div>
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<div class="line number13 index12 alt2"> </div>
<div class="line number14 index13 alt1"><code class="javascript spaces"> </code><code class="javascript plain">}</code></div>
<div class="line number15 index14 alt2"><code class="javascript spaces"> </code><code class="javascript plain">}</code></div>
<div class="line number16 index15 alt1"><code class="javascript plain"></script></code></div>
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<hr>
<p>3. 父组件调用子组件方法</p>
<ul>
<li>父组件Father.vue</li>
</ul>
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<div class="container">
<div class="line number1 index0 alt2"><code class="javascript plain"><template></code></div>
<div class="line number2 index1 alt1"><code class="javascript spaces"> </code><code class="javascript plain"><div></code></div>
<div class="line number3 index2 alt2"><code class="javascript spaces"> </code><code class="javascript plain"><v-header ref=</code><code class="javascript string">'header'</code><code class="javascript plain">></v-header></code></div>
<div class="line number4 index3 alt1"><code class="javascript spaces"> </code><code class="javascript plain"><v-content ref=</code><code class="javascript string">'content'</code><code class="javascript plain">></v-content></code></div>
<div class="line number5 index4 alt2"><code class="javascript spaces"> </code><code class="javascript plain"><v-footer ref=</code><code class="javascript string">'footer'</code><code class="javascript plain">></v-footer></code></div>
<div class="line number6 index5 alt1"><code class="javascript spaces"> </code><code class="javascript plain"><button @click=</code><code class="javascript string">'emitChild1'</code><code class="javascript plain">>ref与on触发</button></code></div>
<div class="line number7 index6 alt2"><code class="javascript spaces"> </code><code class="javascript plain"><button @click=</code><code class="javascript string">'emitChild2'</code><code class="javascript plain">>ref直接触发</button></code></div>
<div class="line number8 index7 alt1"><code class="javascript spaces"> </code><code class="javascript plain"><button @click=</code><code class="javascript string">'emitChild3'</code><code class="javascript plain">>children与on触发</button></code></div>
<div class="line number9 index8 alt2"><code class="javascript spaces"> </code><code class="javascript plain"><button @click=</code><code class="javascript string">'emitChild4'</code><code class="javascript plain">>children直接触发</button></code></div>
<div class="line number10 index9 alt1"><code class="javascript spaces"> </code><code class="javascript plain"></div></code></div>
<div class="line number11 index10 alt2"><code class="javascript plain"></template></code></div>
<div class="line number12 index11 alt1"><code class="javascript plain"><script></code></div>
<div class="line number13 index12 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">import</code> <code class="javascript plain">vHeader from </code><code class="javascript string">'./Header'</code><code class="javascript plain">;</code></div>
<div class="line number14 index13 alt1"><code class="javascript spaces"> </code><code class="javascript keyword">import</code> <code class="javascript plain">vContent from </code><code class="javascript string">'./Content'</code><code class="javascript plain">;</code></div>
<div class="line number15 index14 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">import</code> <code class="javascript plain">vFooter from </code><code class="javascript string">'./Footer'</code><code class="javascript plain">;</code></div>
<div class="line number16 index15 alt1"> </div>
<div class="line number17 index16 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">export</code> <code class="javascript keyword">default</code> <code class="javascript plain">{</code></div>
<div class="line number18 index17 alt1"><code class="javascript spaces"> </code><code class="javascript plain">components:{vHeader,vContent,vFooter},</code></div>
<div class="line number19 index18 alt2"><code class="javascript spaces"> </code><code class="javascript plain">methods:{</code></div>
<div class="line number20 index19 alt1"><code class="javascript spaces"> </code><code class="javascript plain">emitChild1(){</code></div>
<div class="line number21 index20 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">this</code><code class="javascript plain">.$refs.footer.$emit(</code><code class="javascript string">'bridge'</code><code class="javascript plain">,</code><code class="javascript string">'你好吗!'</code><code class="javascript plain">);</code></div>
<div class="line number22 index21 alt1"><code class="javascript spaces"> </code><code class="javascript comments">//打印： 你好吗</code></div>
<div class="line number23 index22 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">this</code><code class="javascript plain">.$refs.footer.$emit(</code><code class="javascript string">'bridge'</code><code class="javascript plain">);</code></div>
<div class="line number24 index23 alt1"><code class="javascript spaces"> </code><code class="javascript comments">//打印：hello world</code></div>
<div class="line number25 index24 alt2"><code class="javascript spaces"> </code><code class="javascript plain">},</code></div>
<div class="line number26 index25 alt1"><code class="javascript spaces"> </code><code class="javascript plain">emitChild2(){</code></div>
<div class="line number27 index26 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">this</code><code class="javascript plain">.$refs.footer.childAction(</code><code class="javascript string">'你好吗!'</code><code class="javascript plain">);</code></div>
<div class="line number28 index27 alt1"><code class="javascript spaces"> </code><code class="javascript comments">//打印： 你好吗</code></div>
<div class="line number29 index28 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">this</code><code class="javascript plain">.$refs.footer.childAction();</code></div>
<div class="line number30 index29 alt1"><code class="javascript spaces"> </code><code class="javascript comments">//打印：hello world</code></div>
<div class="line number31 index30 alt2"><code class="javascript spaces"> </code><code class="javascript plain">},</code></div>
<div class="line number32 index31 alt1"><code class="javascript spaces"> </code><code class="javascript plain">emitChild3(){</code></div>
<div class="line number33 index32 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">this</code><code class="javascript plain">.$children.$emit(</code><code class="javascript string">'bridge'</code><code class="javascript plain">,</code><code class="javascript string">'你好吗!'</code><code class="javascript plain">);</code></div>
<div class="line number34 index33 alt1"><code class="javascript spaces"> </code><code class="javascript comments">//打印： 你好吗</code></div>
<div class="line number35 index34 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">this</code><code class="javascript plain">.$children.$emit(</code><code class="javascript string">'bridge'</code><code class="javascript plain">);</code></div>
<div class="line number36 index35 alt1"><code class="javascript spaces"> </code><code class="javascript comments">//打印：hello world</code></div>
<div class="line number37 index36 alt2"><code class="javascript spaces"> </code><code class="javascript plain">},</code></div>
<div class="line number38 index37 alt1"><code class="javascript spaces"> </code><code class="javascript plain">emitChild4(){</code></div>
<div class="line number39 index38 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">this</code><code class="javascript plain">.$children.childAction(</code><code class="javascript string">'你好吗!'</code><code class="javascript plain">);</code></div>
<div class="line number40 index39 alt1"><code class="javascript spaces"> </code><code class="javascript comments">//打印： 你好吗</code></div>
<div class="line number41 index40 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">this</code><code class="javascript plain">.$children.childAction();</code></div>
<div class="line number42 index41 alt1"><code class="javascript spaces"> </code><code class="javascript comments">//打印：hello world</code></div>
<div class="line number43 index42 alt2"><code class="javascript spaces"> </code><code class="javascript plain">},</code></div>
<div class="line number44 index43 alt1"><code class="javascript spaces"> </code><code class="javascript plain">}</code></div>
<div class="line number45 index44 alt2"><code class="javascript spaces"> </code><code class="javascript plain">}</code></div>
<div class="line number46 index45 alt1"><code class="javascript plain"></script></code></div>
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<ul>
<li>子组件Footer.vue</li>
</ul>
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<div class="container">
<div class="line number1 index0 alt2"><code class="javascript plain"><template></code></div>
<div class="line number2 index1 alt1"><code class="javascript spaces"> </code><code class="javascript plain"><footer>This is footer-component</footer></code></div>
<div class="line number3 index2 alt2"><code class="javascript plain"></template></code></div>
<div class="line number4 index3 alt1"><code class="javascript plain"><script></code></div>
<div class="line number5 index4 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">export</code> <code class="javascript keyword">default</code> <code class="javascript plain">{</code></div>
<div class="line number6 index5 alt1"><code class="javascript spaces"> </code><code class="javascript plain">mounted(){</code></div>
<div class="line number7 index6 alt2"><code class="javascript spaces"> </code><code class="javascript keyword">this</code><code class="javascript plain">.$on(</code><code class="javascript string">'bridge'</code><code class="javascript plain">,(val)=>{</code></div>
<div class="line number8 index7 alt1"><code class="javascript spaces"> </code><code class="javascript keyword">this</code><code class="javascript plain">.childAction(val);</code></div>
<div class="line number9 index8 alt2"><code class="javascript spaces"> </code><code class="javascript plain">});</code></div>
<div class="line number10 index9 alt1"> </div>
<div class="line number11 index10 alt2"><code class="javascript spaces"> </code><code class="javascript plain">},</code></div>
<div class="line number12 index11 alt1"><code class="javascript spaces"> </code><code class="javascript plain">methods:{</code></div>
<div class="line number13 index12 alt2"><code class="javascript spaces"> </code><code class="javascript plain">childAction(val=</code><code class="javascript string">'hello world'</code><code class="javascript plain">){</code></div>
<div class="line number14 index13 alt1"><code class="javascript spaces"> </code><code class="javascript plain">console.log(val)</code></div>
<div class="line number15 index14 alt2"><code class="javascript spaces"> </code><code class="javascript plain">}</code></div>
<div class="line number16 index15 alt1"> </div>
<div class="line number17 index16 alt2"><code class="javascript spaces"> </code><code class="javascript plain">}</code></div>
<div class="line number18 index17 alt1"><code class="javascript spaces"> </code><code class="javascript plain">}</code></div>
<div class="line number19 index18 alt2"><code class="javascript plain"></script></code></div>
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<p></audio></p><br><br>
来源：https://www.cnblogs.com/chris-oil/p/11418727.html
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