JavaScript的StringBuffer工具

 

網上看到的一個javascript例子，通過javascript對象封裝處理，感覺這種思想不錯，特拿來學習

 

 

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