DIV 超出字符数用省略号代替的CSS代码

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<script>
function csubstr(str,len){
if(str.length>10){
return str.substring(0,len)+”…”;
}else{
return str;
}
}
</script>
<div ><script>document.write(csubstr(“aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa”,10));</script></div>