JavaScript的StringBuffer工具

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/******************************************************* * JavaScript的StringBuffer工具 * Date:2011/4/20 *******************************************************/    function StringBuffer() {      this.str = "";      this.objArray = new Array();      this.append = function (s) {          if (this.length() == 0) {              this.objArray[0] = s;          } else {              this.objArray[this.length() + 1] = s;          }      };      this.toString = function () {          if (this.length() == 0) {              return "";          } else {              return this.objArray.join("");          }      };      this.chatAt = function (s) {          if (this.toString() != "") {              return this.toString().indexOf(s);          }      };      this.clear = function () {          if (this.length() != 0) {              this.objArray.length = 0;          }      };      this.length = function () {          return this.objArray.length;      };      this.substring = function (start, end) {          if (start > 0 || start == 0) {              if (end <= this.length() && (end > start)) {                  return this.toString().substring(start, end);              } else {                  alert("JavaScriptException:IndexOutOfBounds");                  return null;              }          } else {              alert("JavaScriptException:IndexOutOfBounds");              return null;          }      };      this.toArray = function () {          var tempArray = this.objArray.join(",");          return tempArray.split(",");      };      this.setcharAt = function (charIndex, str) {          if (charIndex < 0 || charIndex > this.length()) {              alert("JavaScriptException:IndexOutOfBounds");              return null;          } else {              this.objArray[charIndex] = str;          }          return this.toString();      };      this.replace = function (oldchar, newchar) {          var foundChar = this.toString().indexOf(oldchar);          if (foundChar < 0) {              alert("JavaScriptException:not found oldchar");              return null;          } else {              return this.toString().replace(oldchar, newchar);          }      };  }