获取汉字和字母的长度

function getLen(str) {
    var name = '';
    var len = 0;
    var strlen = 0;
    for (var i = 0; i < str.length; i++) {
        charCode = str.charCodeAt(i);
        if (charCode >= 0 && charCode <= 128)
            len += 1;
        else
            len += 2;
    } 
    return len;
}

getLen('家好就abc') //9

getLen('abcdefg') //7