<ul>
<li><a href="./532">html</a></li>
<li><a href="./533">css</a></li>
<li><a href="./534">JavaScript</a>
<ul>
<li><a href="./535">JavaScript Core</a></li>
<li><a href="./536">DOM</a></li>
<li><a href="./537">BOM</a></li>
</ul>
</li>
</ul>
<script>
function traverse(target, callback){
if(target.nodeType === 1){
//if(target.nodeName === 'A')
callback(target);
var c = target.childNodes;
for(var i=0; i<c.length; i++){
traverse(c[i], callback);
}
}
}
traverse(document.getElementById('start'), function(elem){
console.log(elem);
});
</script>
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