JS获取字符串实际长度(包含汉字)

方法一:

var jmz = {};
jmz.GetLength = function(str) {
    ///<summary>获得字符串实际长度,中文2,英文1</summary>
    ///<param name="str">要获得长度的字符串</param>
    var realLength = 0, len = str.length, charCode = -1;
    for (var i = 0; i < len; i++) {
        charCode = str.charCodeAt(i);
        if (charCode >= 0 && charCode <= 128) 
              realLength += 1;
        else
              realLength += 2;
    }
    return realLength;
};

alert(jmz.GetLength('测试测试ceshiceshi));        

方法二(更简洁的方法):

var l = str.length;
var blen = 0;
for(i=0; i<l; i++) {
if ((str.charCodeAt(i) & 0xff00) != 0) {
blen ++;
}
blen ++;
}

方法三(更更简洁的方法):

var jmz = {};
jmz.GetLength = function(str) {
    return str.replace(/[u0391-uFFE5]/g,"aa").length;   //先把中文替换成两个字节的英文,在计算长度
};  
alert(jmz.GetLength(
'测试测试ceshiceshi'));
原文地址:https://www.cnblogs.com/leezhxing/p/4103267.html