on
描述 (Description)
它将事件绑定到对象和回调函数。 每当触发事件时，它都会执行回调。
语法 (Syntax)
object.on(event, callback function, [context])
参数 (Parameters)
event - 它绑定一个对象。
callback - 它是对代码的引用。
context - 它是一个可以传递给回调函数的对象。
例子 (Example)
<!DOCTYPE html>
<html>
<head>
<title>Event On 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:'IoWiki!!!'}, Backbone.Events);
// The on() method will bind callback function to an object and
// invoked whenever an event triggers
myVal.on('myFunc', function () {
document.write("The triggered value is: ");
document.write(this.name);//The name will get display by referring the current object
});
//It triggers the 'myFunc' event on object 'myVal'
myVal.trigger('myFunc');
</script>
</body>
</html>
输出 (Output)
让我们执行以下步骤来查看上述代码的工作原理 -
将以上代码保存在on.htm文件中
在浏览器中打开此HTML文件。
