//判断一个汉子等于两个字符
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;
}