- function StringBuffer() {
- this._objArray = [];
- this._undoFlag = false;
- };
- StringBuffer.prototype.toString = function() {
- if(this._objArray.length==0) {
- return '';
- }
- var str = this._objArray.join('');
- if(this._objArray.length > 1) {
- this.clear();
- this.append(str);
- }
- this._undoFlag = false;
- return str;
- };
- StringBuffer.prototype.append = function(object) {
- this._objArray[this._objArray.length] = object;
- this._undoFlag = true;
- return this;
- };
- StringBuffer.prototype.clear = function() {
- this._objArray.length = 0;
- this._undoFlag = false;
- };
- StringBuffer.prototype.undoLastAppend = function() {
- if(this._undoFlag) {
- this._objArray.length = this._objArray.length -1;
- this._undoFlag = false;
- }
- };
- StringBuffer.prototype.setSize = function(size) {
- if(size==null || size<=0) {
- this.clear();
- return;
- }
- var str = this._objArray.join('');
- if(size < str.length) {
- str = str.substring(0, size);
- this.clear();
- this.append(str);
- } else if(this._objArray.length > 1) {
- this.clear();
- this.append(str);
- }
- this._undoFlag = false;
- };
- StringBuffer.prototype.getSize = function() {
- var str = this.toString();
- return str.length;
- };
一個js寫的StringBuffer類
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