var jmz = {};jmz.GetLength = function(str) {  ///<summary>获得字符串实际长度，中文2，英文1</summary>  ///<param name="str">要获得长度的字符串</param>  var realLength = 0, len = str.length, charCode = -1;  for (var i = 0; i < len; i++) {    charCode = str.charCodeAt(i);    if (charCode >= 0 && charCode <= 128)        realLength += 1;    else       realLength += 2;  }  return realLength;};alert(jmz.GetLength('测试测试ceshiceshi));

var l = str.length;var blen = 0;for(i=0; i<l; i++) {if ((str.charCodeAt(i) & 0xff00) != 0) {blen ++;}blen ++;}

var jmz = {};jmz.GetLength = function(str) {  return str.replace(/[/u0391-/uFFE5]/g,"aa").length;  //先把中文替换成两个字节的英文，在计算长度};  alert(jmz.GetLength('测试测试ceshiceshi'));