JavaScript实现文字超出指定长度显示省略号的代码示例

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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>超过的文字用省略号代替的js写法</title>
</head>

<body>
<script>
 function cutString(str, len) {
 //length属性读出来的汉字长度为1
 if(str.length*2 <= len) {
  return str;
 }
 var strlen = 0;
 var s = "";
 for(var i = 0;i < str.length; i++) {
  s = s + str.charAt(i);
  if (str.charCodeAt(i) > 128) {
   strlen = strlen + 2;
   if(strlen >= len){
    return s.substring(0,s.length-1) + "...";
   }
  } else {
   strlen = strlen + 1;
   if(strlen >= len){
    return s.substring(0,s.length-2) + "...";
   }
  }
 }
 return s;
}

window.onload=function(){
  var str = document.getElementById('cut_str').innerHTML;
  var s=cutString(str,15);
  document.getElementById('cut_str').innerHTML=s;
}
</script>

<div class="js_cut_str"><p id="cut_str">超过的文字用省略号代替的js写法。</p></div>
</body>
</html>