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+---
+title: Object.prototype
+slug: conflicting/Web/JavaScript/Reference/Global_Objects/Object
+tags:
+ - JavaScript
+ - Object
+ - 待翻譯
+translation_of: Web/JavaScript/Reference/Global_Objects/Object
+translation_of_original: Web/JavaScript/Reference/Global_Objects/Object/prototype
+original_slug: Web/JavaScript/Reference/Global_Objects/Object/prototype
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>Object.prototype</strong></code> 代表 {{jsxref("Object")}} 的原型物件。</p>
+
+<div>{{js_property_attributes(0, 0, 0)}}</div>
+
+<h2 id="描述">描述</h2>
+
+<p>All objects in JavaScript are descended from {{jsxref("Object")}}; all objects inherit methods and properties from <code>Object.prototype</code>, although they may be overridden (except an <code>Object</code> with a <code>null</code> prototype, i.e. <code>Object.create(null)</code>). For example, other constructors' prototypes override the <code>constructor</code> property and provide their own {{jsxref("Object.prototype.toString()", "toString()")}} methods. Changes to the <code>Object</code> prototype object are propagated to all objects unless the properties and methods subject to those changes are overridden further along the prototype chain.</p>
+
+<h2 id="屬性">屬性</h2>
+
+<dl>
+ <dt>{{jsxref("Object.prototype.constructor")}}</dt>
+ <dd>Specifies the function that creates an object's prototype.</dd>
+ <dt>{{jsxref("Object.prototype.__proto__")}} {{non-standard_inline}}</dt>
+ <dd>Points to the object which was used as prototype when the object was instantiated.</dd>
+ <dt>{{jsxref("Object.prototype.__noSuchMethod__")}} {{non-standard_inline}}</dt>
+ <dd>Allows a function to be defined that will be executed when an undefined object member is called as a method.</dd>
+ <dt><s class="obsoleteElement">{{jsxref("Object.prototype.__count__")}} {{obsolete_inline}}</s></dt>
+ <dd><s class="obsoleteElement">Used to return the number of enumerable properties directly on a user-defined object, but has been removed.</s></dd>
+ <dt><s class="obsoleteElement">{{jsxref("Object.prototype.__parent__")}} {{obsolete_inline}}</s></dt>
+ <dd><s class="obsoleteElement">Used to point to an object's context, but has been removed.</s></dd>
+</dl>
+
+<h2 id="方法">方法</h2>
+
+<dl>
+ <dt>{{jsxref("Object.prototype.__defineGetter__()")}} {{non-standard_inline}} {{deprecated_inline}}</dt>
+ <dd>Associates a function with a property that, when accessed, executes that function and returns its return value.</dd>
+ <dt>{{jsxref("Object.prototype.__defineSetter__()")}} {{non-standard_inline}} {{deprecated_inline}}</dt>
+ <dd>Associates a function with a property that, when set, executes that function which modifies the property.</dd>
+ <dt>{{jsxref("Object.prototype.__lookupGetter__()")}} {{non-standard_inline}} {{deprecated_inline}}</dt>
+ <dd>Returns the function associated with the specified property by the {{jsxref("Object.defineGetter", "__defineGetter__")}} method.</dd>
+ <dt>{{jsxref("Object.prototype.__lookupSetter__()")}} {{non-standard_inline}} {{deprecated_inline}}</dt>
+ <dd>Returns the function associated with the specified property by the {{jsxref("Object.defineSetter", "__defineSetter__")}} method.</dd>
+ <dt>{{jsxref("Object.prototype.hasOwnProperty()")}}</dt>
+ <dd>Returns a boolean indicating whether an object contains the specified property as a direct property of that object and not inherited through the prototype chain.</dd>
+ <dt>{{jsxref("Object.prototype.isPrototypeOf()")}}</dt>
+ <dd>Returns a boolean indication whether the specified object is in the prototype chain of the object this method is called upon.</dd>
+ <dt>{{jsxref("Object.prototype.propertyIsEnumerable()")}}</dt>
+ <dd>Returns a boolean indicating if the internal <a href="/en-US/docs/ECMAScript_DontEnum_attribute" title="ECMAScript_DontEnum_attribute">ECMAScript DontEnum attribute</a> is set.</dd>
+ <dt>{{jsxref("Object.prototype.toSource()")}} {{non-standard_inline}}</dt>
+ <dd>Returns string containing the source of an object literal representing the object that this method is called upon; you can use this value to create a new object.</dd>
+ <dt>{{jsxref("Object.prototype.toLocaleString()")}}</dt>
+ <dd>Calls {{jsxref("Object.toString", "toString()")}}.</dd>
+ <dt>{{jsxref("Object.prototype.toString()")}}</dt>
+ <dd>Returns a string representation of the object.</dd>
+ <dt>{{jsxref("Object.prototype.unwatch()")}} {{non-standard_inline}}</dt>
+ <dd>Removes a watchpoint from a property of the object.</dd>
+ <dt>{{jsxref("Object.prototype.valueOf()")}}</dt>
+ <dd>Returns the primitive value of the specified object.</dd>
+ <dt>{{jsxref("Object.prototype.watch()")}} {{non-standard_inline}}</dt>
+ <dd>Adds a watchpoint to a property of the object.</dd>
+ <dt><s class="obsoleteElement">{{jsxref("Object.prototype.eval()")}} {{obsolete_inline}}</s></dt>
+ <dd><s class="obsoleteElement">Used to evaluate a string of JavaScript code in the context of the specified object, but has been removed.</s></dd>
+</dl>
+
+<h2 id="範例">範例</h2>
+
+<p>因為 JavaScript 並沒有子類別的物件,所以原型是個很有用的解決辦法, 使某些函數作為物件的基本類別物件。例如:</p>
+
+<pre class="brush: js">var Person = function() {
+ this.canTalk = true;
+};
+
+Person.prototype.greet = function() {
+ if (this.canTalk) {
+ console.log('Hi, I am ' + this.name);
+ }
+};
+
+var Employee = function(name, title) {
+ Person.call(this);
+ this.name = name;
+ this.title = title;
+};
+
+Employee.prototype = Object.create(Person.prototype);
+Employee.prototype.constructor = Employee;
+
+Employee.prototype.greet = function() {
+ if (this.canTalk) {
+ console.log('Hi, I am ' + this.name + ', the ' + this.title);
+ }
+};
+
+var Customer = function(name) {
+ Person.call(this);
+ this.name = name;
+};
+
+Customer.prototype = Object.create(Person.prototype);
+Customer.prototype.constructor = Customer;
+
+var Mime = function(name) {
+ Person.call(this);
+ this.name = name;
+ this.canTalk = false;
+};
+
+Mime.prototype = Object.create(Person.prototype);
+Mime.prototype.constructor = Mime;
+
+var bob = new Employee('Bob', 'Builder');
+var joe = new Customer('Joe');
+var rg = new Employee('Red Green', 'Handyman');
+var mike = new Customer('Mike');
+var mime = new Mime('Mime');
+
+bob.greet();
+// Hi, I am Bob, the Builder
+
+joe.greet();
+// Hi, I am Joe
+
+rg.greet();
+// Hi, I am Red Green, the Handyman
+
+mike.greet();
+// Hi, I am Mike
+
+mime.greet();
+</pre>
+
+<h2 id="規範">規範</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comment</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES1')}}</td>
+ <td>{{Spec2('ES1')}}</td>
+ <td>Initial definition. Implemented in JavaScript 1.0.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES5.1', '#sec-15.2.3.1', 'Object.prototype')}}</td>
+ <td>{{Spec2('ES5.1')}}</td>
+ <td> </td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-object.prototype', 'Object.prototype')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Android</th>
+ <th>Chrome for Android</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="參見">參見</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Introduction_to_Object-Oriented_JavaScript">Introduction to Object-Oriented JavaScript</a></li>
+</ul>