JS 文本框 maxlength（中文字符长度） 解决方案

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1，JS

function limitLength(value, byteLength, title, attribute) {//限制输入框字数 
       var newvalue = value.replace(/[^\x00-\xff]/g, "**"); 
       var length = newvalue.length; 
   
       //当填写的字节数小于设置的字节数 
      if (length * 1 <=byteLength * 1){ 
            return; 
      } 
      var limitDate = newvalue.substr(0, byteLength); 
      var count = 0; 
      var limitvalue = ""; 
     for (var i = 0; i < limitDate.length; i++) { 
             var flat = limitDate.substr(i, 1); 
            if (flat == "*") { 
                  count++; 
            } 
     } 
     var size = 0; 
     var istar = newvalue.substr(byteLength * 1 - 1, 1);//校验点是否为“×” 
    
    //if 基点是×; 判断在基点内有×为偶数还是奇数   
     if (count % 2 == 0) { 
              //当为偶数时 
            size = count / 2 + (byteLength * 1 - count); 
            limitvalue = value.substr(0, size); 
    } else { 
            //当为奇数时 
            size = (count - 1) / 2 + (byteLength * 1 - count); 
            limitvalue = value.substr(0, size); 
    } 
   alert(title + "最大输入" + byteLength + "个字节（相当于"+byteLength /2+"个汉字）！"); 
   document.getElementById(attribute).value = limitvalue; 
   return; 
}

2,

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