<script type="text/javascript">
window.onload = function SubLabel() {
for(var i = 0 ; i < document.getElementsByTagName("span").length;i++)
{
if (document.getElementsByTagName("span")[i].innerHTML.length > 20) {
document.getElementsByTagName("span")[i].innerHTML=document.getElementsByTagName("span")[i].innerHTML.substring(0, 17) + "...";
}
}
}
</script>
应该是要放在文档结尾的吧