js-统计中文，英文，字符的个数

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 += 1;
        } else {
          len += 0.5;
        }
      }
      return len;
    }

    alert(getByteLen('aa7,.o哈'));