js截取固定长度字符串，中文字符算双字节

<html>
<body>

<script type="text/javascript">
//str为目标字符串，length为目标长度，中文字符算两个单字节字符
function getSubStrIncludeChinese(str,length){
  if(str.length*2<=length){
    return str;
  }else{
    var currentLength = 0;
    var resStr = "";
    for(var i=0;i<str.length;i++){
      if(str.charCodeAt(i)>=0 && str.charCodeAt(i)<=255){
        currentLength +=1;
      }else{
        currentLength +=2;
      }
      if(currentLength > length){
        return resStr;
      }
      resStr += str[i];
      if(currentLength == length){
        return resStr;
      }
    }
    return str;
  }
}
var str ="付费ds额2fds附属设施"
document.write(getSubStrIncludeChinese(str,14))
</script>
</body>
</html>

posted on 2017-02-28 09:48 王雪皓阅读(333) 评论(0) 收藏举报