142.环形链表 II
<pre><code class="language-js">var detectCycle = function(head) {if(!head)return null;
let pre=head,cur=head;
while(cur&&cur.next){
pre=pre.next;
cur=cur.next.next;
if(pre===cur){
let temp=head;
while(temp!==pre){
pre=pre.next;
temp=temp.next;
}
return pre
}
}
return null;
};
</code></pre><br><br>
来源：https://www.cnblogs.com/KooTeam/p/19187963
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