正如它的名字说明一样，它可以用来停止监听到另一对象的事件。
语法
object.stopListening(other, event, callback)
参数：
- other: 它定义了其他对象的名称。
- event: 它绑定对象。
- callback: 这是参考代码，并调用对象作为上下文。
示例
<!DOCTYPE html> <head> <title>Event Once Example</title> <script src="https://code.jquery.com/jquery-2.1.3.min.js" type="text/javascript"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js" type="text/javascript"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js" type="text/javascript"></script> </head> <body> <script type="text/javascript"> //Create an object 'myVal' and 'myVal1' and extend them using Backbone.Events method var myVal = _.extend({name:'Hello..'}, Backbone.Events); var myVal1 = _.extend({name:'Welcome to zaixian..'}, Backbone.Events); //created the 'listenMe' callback function and invoked when one object listens to particular event on another object var listenMe = function(){ document.write("The value is: "); document.write(this.name); }; //The object 'myVal1' listens once for the 'listenMe' event triggered on object 'myVal' myVal1.listenTo(myVal, 'listenMe', listenMe); //The 'myVal' has no 'listenMe' event and display the value of 'myVal1' myVal.trigger('listenMe'); //The 'myVal1' stops listening to specific event on 'myVal' and displays nothing myVal1.stopListening(myVal,'listenMe'); myVal.trigger('listenMe'); </script> </body> </html>
输出
让我们进行以下步骤来看看上面的代码工作：
-
保存上述代码在文件stoplistening.html
-
在浏览器中打开这个HTML文件。
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BackboneJS事件listenTo
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BackboneJS事件listenToOnce