方法一：文档碎片
<body>
<ul></ul>
<script>
var oUl = document.getElementsByTagName('ul')[0];
var oFrag = document.createDocumentFragment();
for (var i = 0; i < 10000; i++) {
var oLi = document.createElement('li');
oLi.innerHTML = i;
oFrag.appendChild(oLi);
}
oUl.appendChild(oFrag);
</script>
方法二：利用字符串直接写入
<body>
<ul></ul>
<script>
var oUl = document.getElementsByTagName('ul')[0];
var str = '';
for (var i = 0; i < 100; i++) {
str += '<li>' + i + '</li>';
}
oUl.innerHTML = str;
</script>