function getStrLength(str){     var len = 0;     for (var i = 0; i < str.length; i++) {            var c = str.charCodeAt(i);            //单字节加1             if ((c >= 0x0001 && c <= 0x007e) || (0xff60 <= c && c <= 0xff9f)) {                len++;            }else {                len += 2;            }     }     return len;}