DIV CSS 佈局教程網

本文實例講述了JS擴展類，克隆對象與混合類。分享給大家供大家參考，具體如下：

1.類擴展

/* EditInPlaceField類 */
/* 擴展函數 */
function extend(subClass, superClass) {
 var F = function() {};
 F.prototype = superClass.prototype;
 subClass.prototype = new F();
 subClass.prototype.constructor = subClass;
 subClass.superclass = superClass.prototype;
 if(superClass.prototype.constructor == Object.prototype.constructor) {
  superClass.prototype.constructor = superClass;
 }
}
function EditInPlaceField(id, parent, value) { // 構造函數
 this.id = id;
 this.value = value || 'default value';
 this.parentElement = parent;
 this.createElements(this.id);
 this.attachEvents();
};
EditInPlaceField.prototype = {
 createElements: function(id) {
  this.containerElement = document.createElement('div');
  this.parentElement.appendChild(this.containerElement);
  this.staticElement = document.createElement('span');
  this.containerElement.appendChild(this.staticElement);
  this.staticElement.innerHTML = this.value;
  this.fieldElement = document.createElement('input');
  this.fieldElement.type = 'text';
  this.fieldElement.value = this.value;
  this.containerElement.appendChild(this.fieldElement);
  this.saveButton = document.createElement('input');
  this.saveButton.type = 'button';
  this.saveButton.value = 'Save';
  this.containerElement.appendChild(this.saveButton);
  this.cancelButton = document.createElement('input');
  this.cancelButton.type = 'button';
  this.cancelButton.value = 'Cancel';
  this.containerElement.appendChild(this.cancelButton);
  this.convertToText();
 },
 attachEvents: function() {
  var that = this;
  addEvent(this.staticElement, 'click', function() { that.convertToEditable(); });
  addEvent(this.saveButton, 'click', function() { that.save(); });
  addEvent(this.cancelButton, 'click', function() { that.cancel(); });
 },
 convertToEditable: function() {
  this.staticElement.style.display = 'none';
  this.fieldElement.style.display = 'inline';
  this.saveButton.style.display = 'inline';
  this.cancelButton.style.display = 'inline';
  this.setValue(this.value);
 },
 save: function() {
  this.value = this.getValue();
  var that = this;
  var callback = {
   success: function() { that.convertToText(); },
   failure: function() { alert('Error saving value.'); }
  };
  ajaxRequest('GET', 'save.php?id=' + this.id + '&value=' + this.value, callback);
 },
 cancel: function() {
  this.convertToText();
 },
 convertToText: function() {
  this.fieldElement.style.display = 'none';
  this.saveButton.style.display = 'none';
  this.cancelButton.style.display = 'none';
  this.staticElement.style.display = 'inline';
  this.setValue(this.value);
 },
 setValue: function(value) {
  this.fieldElement.value = value;
  this.staticElement.innerHTML = value;
 },
 getValue: function() {
  return this.fieldElement.value;
 }
};
var titleClassical = new EditInPlaceField('titleClassical', $('doc'), 'Title Here');
var currentTitleText = titleClassical.getValue();
/* EditInPlaceArea類 */
function EditInPlaceArea(id, parent, value) {
 EditInPlaceArea.superclass.constructor.call(this, id, parent, value);
};
extend(EditInPlaceArea, EditInPlaceField);
// Override certain methods.
EditInPlaceArea.prototype.createElements = function(id) {
 this.containerElement = document.createElement('div');
 this.parentElement.appendChild(this.containerElement);
 this.staticElement = document.createElement('p');
 this.containerElement.appendChild(this.staticElement);
 this.staticElement.innerHTML = this.value;
 this.fieldElement = document.createElement('textarea');
 this.fieldElement.value = this.value;
 this.containerElement.appendChild(this.fieldElement);
 this.saveButton = document.createElement('input');
 this.saveButton.type = 'button';
 this.saveButton.value = 'Save';
 this.containerElement.appendChild(this.saveButton);
 this.cancelButton = document.createElement('input');
 this.cancelButton.type = 'button';
 this.cancelButton.value = 'Cancel';
 this.containerElement.appendChild(this.cancelButton);
 this.convertToText();
};
EditInPlaceArea.prototype.convertToEditable = function() {
 this.staticElement.style.display = 'none';
 this.fieldElement.style.display = 'block';
 this.saveButton.style.display = 'inline';
 this.cancelButton.style.display = 'inline';
 this.setValue(this.value);
};
EditInPlaceArea.prototype.convertToText = function() {
 this.fieldElement.style.display = 'none';
 this.saveButton.style.display = 'none';
 this.cancelButton.style.display = 'none';
 this.staticElement.style.display = 'block';
 this.setValue(this.value);
};

2.對象克隆

/* EditInPlaceField對象*/
/* 克隆函數 */
function clone(object) {
  function F() {}
  F.prototype = object;
  return new F;
}
var EditInPlaceField = {
 configure: function(id, parent, value) {
  this.id = id;
  this.value = value || 'default value';
  this.parentElement = parent;
  this.createElements(this.id);
  this.attachEvents();
 },
 createElements: function(id) {
  this.containerElement = document.createElement('div');
  this.parentElement.appendChild(this.containerElement);
  this.staticElement = document.createElement('span');
  this.containerElement.appendChild(this.staticElement);
  this.staticElement.innerHTML = this.value;
  this.fieldElement = document.createElement('input');
  this.fieldElement.type = 'text';
  this.fieldElement.value = this.value;
  this.containerElement.appendChild(this.fieldElement);
  this.saveButton = document.createElement('input');
  this.saveButton.type = 'button';
  this.saveButton.value = 'Save';
  this.containerElement.appendChild(this.saveButton);
  this.cancelButton = document.createElement('input');
  this.cancelButton.type = 'button';
  this.cancelButton.value = 'Cancel';
  this.containerElement.appendChild(this.cancelButton);
  this.convertToText();
 },
 attachEvents: function() {
  var that = this;
  addEvent(this.staticElement, 'click', function() { that.convertToEditable(); });
  addEvent(this.saveButton, 'click', function() { that.save(); });
  addEvent(this.cancelButton, 'click', function() { that.cancel(); });
 },
 convertToEditable: function() {
  this.staticElement.style.display = 'none';
  this.fieldElement.style.display = 'inline';
  this.saveButton.style.display = 'inline';
  this.cancelButton.style.display = 'inline';
  this.setValue(this.value);
 },
 save: function() {
  this.value = this.getValue();
  var that = this;
  var callback = {
   success: function() { that.convertToText(); },
   failure: function() { alert('Error saving value.'); }
  };
  ajaxRequest('GET', 'save.php?id=' + this.id + '&value=' + this.value, callback);
 },
 cancel: function() {
  this.convertToText();
 },
 convertToText: function() {
  this.fieldElement.style.display = 'none';
  this.saveButton.style.display = 'none';
  this.cancelButton.style.display = 'none';
  this.staticElement.style.display = 'inline';
  this.setValue(this.value);
 },
 setValue: function(value) {
  this.fieldElement.value = value;
  this.staticElement.innerHTML = value;
 },
 getValue: function() {
  return this.fieldElement.value;
 }
};
var titlePrototypal = clone(EditInPlaceField);
titlePrototypal.configure(' titlePrototypal ', $('doc'), 'Title Here');
var currentTitleText = titlePrototypal.getValue();
/* EditInPlaceArea對象*/
var EditInPlaceArea = clone(EditInPlaceField);
// Override certain methods.
EditInPlaceArea.createElements = function(id) {
 this.containerElement = document.createElement('div');
 this.parentElement.appendChild(this.containerElement);
 this.staticElement = document.createElement('p');
 this.containerElement.appendChild(this.staticElement);
 this.staticElement.innerHTML = this.value;
 this.fieldElement = document.createElement('textarea');
 this.fieldElement.value = this.value;
 this.containerElement.appendChild(this.fieldElement);
 this.saveButton = document.createElement('input');
 this.saveButton.type = 'button';
 this.saveButton.value = 'Save';
 this.containerElement.appendChild(this.saveButton);
 this.cancelButton = document.createElement('input');
 this.cancelButton.type = 'button';
 this.cancelButton.value = 'Cancel';
 this.containerElement.appendChild(this.cancelButton);
 this.convertToText();
};
EditInPlaceArea.convertToEditable = function() {
 this.staticElement.style.display = 'none';
 this.fieldElement.style.display = 'block';
 this.saveButton.style.display = 'inline';
 this.cancelButton.style.display = 'inline';
 this.setValue(this.value);
};
EditInPlaceArea.convertToText = function() {
 this.fieldElement.style.display = 'none';
 this.saveButton.style.display = 'none';
 this.cancelButton.style.display = 'none';
 this.staticElement.style.display = 'block';
 this.setValue(this.value);
};

3.混合類

/* 混合類 */
/* 混合函數 */
function augment(receivingClass, givingClass) {
 for(methodName in givingClass.prototype) {
  if(!receivingClass.prototype[methodName]) {
   receivingClass.prototype[methodName] = givingClass.prototype[methodName];
  }
 }
}
/* 改進的增加函數 */
function augment(receivingClass, givingClass) {
 if(arguments[2]) { // Only give certain methods.
  for(var i = 2, len = arguments.length; i < len; i++) {
   receivingClass.prototype[arguments[i]] = givingClass.prototype[arguments[i]];
  }
 }
 else { // Give all methods.
  for(methodName in givingClass.prototype) {
   if(!receivingClass.prototype[methodName]) {
    receivingClass.prototype[methodName] = givingClass.prototype[methodName];
   }
  }
 }
}
var EditInPlaceMixin = function() {};
EditInPlaceMixin.prototype = {
 createElements: function(id) {
  this.containerElement = document.createElement('div');
  this.parentElement.appendChild(this.containerElement);
  this.staticElement = document.createElement('span');
  this.containerElement.appendChild(this.staticElement);
  this.staticElement.innerHTML = this.value;
  this.fieldElement = document.createElement('input');
  this.fieldElement.type = 'text';
  this.fieldElement.value = this.value;
  this.containerElement.appendChild(this.fieldElement);
  this.saveButton = document.createElement('input');
  this.saveButton.type = 'button';
  this.saveButton.value = 'Save';
  this.containerElement.appendChild(this.saveButton);
  this.cancelButton = document.createElement('input');
  this.cancelButton.type = 'button';
  this.cancelButton.value = 'Cancel';
  this.containerElement.appendChild(this.cancelButton);
  this.convertToText();
 },
 attachEvents: function() {
  var that = this;
  addEvent(this.staticElement, 'click', function() { that.convertToEditable(); });
  addEvent(this.saveButton, 'click', function() { that.save(); });
  addEvent(this.cancelButton, 'click', function() { that.cancel(); });
 },
 convertToEditable: function() {
  this.staticElement.style.display = 'none';
  this.fieldElement.style.display = 'inline';
  this.saveButton.style.display = 'inline';
  this.cancelButton.style.display = 'inline';
  this.setValue(this.value);
 },
 save: function() {
  this.value = this.getValue();
  var that = this;
  var callback = {
   success: function() { that.convertToText(); },
   failure: function() { alert('Error saving value.'); }
  };
  ajaxRequest('GET', 'save.php?id=' + this.id + '&value=' + this.value, callback);
 },
 cancel: function() {
  this.convertToText();
 },
 convertToText: function() {
  this.fieldElement.style.display = 'none';
  this.saveButton.style.display = 'none';
  this.cancelButton.style.display = 'none';
  this.staticElement.style.display = 'inline';
  this.setValue(this.value);
 },
 setValue: function(value) {
  this.fieldElement.value = value;
  this.staticElement.innerHTML = value;
 },
 getValue: function() {
  return this.fieldElement.value;
 }
};
/* EditInPlaceField class. */
function EditInPlaceField(id, parent, value) {
 this.id = id;
 this.value = value || 'default value';
 this.parentElement = parent;
 this.createElements(this.id);
 this.attachEvents();
};
augment(EditInPlaceField, EditInPlaceMixin);
/* EditInPlaceArea class. */
function EditInPlaceArea(id, parent, value) {
 this.id = id;
 this.value = value || 'default value';
 this.parentElement = parent;
 this.createElements(this.id);
 this.attachEvents();
};
// Add certain methods so that augment won't include them.
EditInPlaceArea.prototype.createElements = function(id) {
 this.containerElement = document.createElement('div');
 this.parentElement.appendChild(this.containerElement);
 this.staticElement = document.createElement('p');
 this.containerElement.appendChild(this.staticElement);
 this.staticElement.innerHTML = this.value;
 this.fieldElement = document.createElement('textarea');
 this.fieldElement.value = this.value;
 this.containerElement.appendChild(this.fieldElement);
 this.saveButton = document.createElement('input');
 this.saveButton.type = 'button';
 this.saveButton.value = 'Save';
 this.containerElement.appendChild(this.saveButton);
 this.cancelButton = document.createElement('input');
 this.cancelButton.type = 'button';
 this.cancelButton.value = 'Cancel';
 this.containerElement.appendChild(this.cancelButton);
 this.convertToText();
};
EditInPlaceArea.prototype.convertToEditable = function() {
 this.staticElement.style.display = 'none';
 this.fieldElement.style.display = 'block';
 this.saveButton.style.display = 'inline';
 this.cancelButton.style.display = 'inline';
 this.setValue(this.value);
};
EditInPlaceArea.prototype.convertToText = function() {
 this.fieldElement.style.display = 'none';
 this.saveButton.style.display = 'none';
 this.cancelButton.style.display = 'none';
 this.staticElement.style.display = 'block';
 this.setValue(this.value);
};
augment(EditInPlaceArea, EditInPlaceMixin);

點評：

js分為類和對象、函數。
其中又包含多種形式，屬性，數組屬性，函數，私有函數，公有函數，靜態函數。
小的基礎方法，可以有大的用途，比如extend方法，clone方法，還有augment方法。

更多關於JavaScript相關內容可查看本站專題：《JavaScript常用函數技巧匯總》、《javascript面向對象入門教程》、《JavaScript中json操作技巧總結》、《JavaScript切換特效與技巧總結》、《JavaScript查找算法技巧總結》、《JavaScript動畫特效與技巧匯總》、《JavaScript錯誤與調試技巧總結》、《JavaScript數據結構與算法技巧總結》、《JavaScript遍歷算法與技巧總結》及《JavaScript數學運算用法總結》

希望本文所述對大家JavaScript程序設計有所幫助。