<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title>Document</title></head><body> <ul id="u"><li id="first"></li> <li></li> <li></li> <li></li> <li></li> <li></li></ul> <script> window.onload=function(){ var ul=document.getElementById('u'), x=document.getElementById('first'), i=0, lis=new Array() while (x) { lis[i].push(x.nextSibling); i++; x=x.nextSibling; } } </script></body></html>浏览器总是提示这个Cannot read property 'push' of undefined at window.onload (test.html:21)，js中不是能直接用push方法的么
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