javascript计算字符串长度

学习了：https://blog.csdn.net/u012934325/article/details/75214847

function getByteLen(val) {    var len = 0;    for (var i = 0; i < val.length; i++) {        var a = val.charAt(i);        if (a.match(/[^\x00-\xff]/ig) != null) {            len += 2;        }        else {            len += 1;        }    }    return len;}