### 方法一： ``` String.prototype.gblen = function() { var len = 0; for (var i=0; i<this.length; i++) { if (this.charCodeAt(i)>127 || this.charCodeAt(i)==94) { len += 2; } else { len ++; } } return len; } ``` ### 方法二： ``` String.prototype.gblen = function() { var len = 0; for (var i=0; i<this.length; i++) { if (this.charCodeAt(i)>127 || this.charCodeAt(i)==94) { len += 2; } else { len ++; } } return len; } ``` ### 方法三： ``` 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; }; ``` ### 方法四： ``` var l = str.length; var blen = 0; for(i=0; i<l; i++) { if ((str.charCodeAt(i) & 0xff00) != 0) { blen ++; } blen ++; } ``` ### 方法五： ``` 把双字节的替换成两个单字节的然后再获得长度 getBLen = function(str) { if (str == null) return 0; if (typeof str != "string"){ str += ""; } return str.replace(/[^\x00-\xff]/g,"01").length; } ```