JS字符串与汉字的字节获取

function getStrLeng(str){
    var realLength = 0;
    var len = str.length;
    var charCode = -1;
    for(var i = 0; i < len; i++){
        charCode = str.charCodeAt(i);
        if (charCode >= 0 && charCode <= 128) { 
            realLength += 1;
        }else{ 
            // 如果是中文则长度加2
            realLength += 2;
        }
    } 
    return realLength;
}

var lenReg = function(str){

    return str.replace(/[^\x00-\xFF]/g,‘**‘).length;

}