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BackboneJS off事件
2018-01-04 18:05 更新
描述
此事件從對(duì)象中刪除回調(diào)函數(shù)或所有事件。
語(yǔ)法
object.off(event, callback function, [context])
參數(shù)
event：它綁定一個(gè)對(duì)象。
callback：它是對(duì)代碼的引用。
context：它是一個(gè)可以傳遞給回調(diào)函數(shù)的對(duì)象。
例
<!DOCTYPE html>
<head>
<title>Event Off 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">
//Here creating an object 'myVal' and extending with Backbone.Events method
var myVal = _.extend({name:'hello'}, Backbone.Events);
var myFunc = function () {
document.write('Hello');
};
var myFunc1 = function () {
document.write('Welcome to TutorialsPoint');
};
//The on() method will bind the callback function to objects 'myFunc' and 'myFunc1'
myVal.on('log',myFunc);
myVal.on('log',myFunc1);
document.write('Before using off event, values will be: ');
//trigger() method callbacks for the given event and display the text defined in the 'myFunc' and 'myFunc1' functions
myVal.trigger('log');
//The off() method removes the callback for 'myFunc' and logs only text of 'myFunc1'
myVal.off('log',myFunc);
document.write("<br>");
document.write('After using off event, values will be: ');
myVal.trigger('log');
</script>
</body>
</html>
輸出
讓我們執(zhí)行以下步驟，看看上面的代碼如何工作：
- 將上面的代碼保存在off.htm文件中
- 在瀏覽器中打開此HTML文件。
Before using off event, values will be: HelloWelcome to TutorialsPoint
After using off event, values will be: Welcome to TutorialsPoint
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