<ul>
<li> index = 0 </li>
<li> index = 1 </li>
<li> index = 2 </li>
<li> index = 3 </li>
</ul>
<script type="text/javascript">
var nodes = document.getElementsByTagName('li');
for(i = 0;i<nodes.length;i+=1) {
nodes[i].onclick = function() {
console.log(i+1); //不使用闭包的话,值每次都是4
}(4);
}
</script>
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