使用JS是可以让函数不直接执行的,而是在过了一个指定的时间间隔后才执行。这就叫做事件事件。
With JavaScript, it is possible to execute some code NOT immediately after a function is called, but after a specified time interval. This is called timing events.
使用JS是可以让函数不直接执行的,而是在过了一个指定的时间间隔后才执行。这就叫做事件事件。
JavaScript Timing Events
JS时间事件
With JavaScript, it is possible to execute some code NOT immediately after a function is called, but after a specified time interval. This is called timing events.
使用JS是可以让函数不直接执行的,而是在过了一个指定的时间间隔后才执行。这就叫做事件事件。
It's very easy to time events in JavaScript. The two key methods that are used are:
JS的时间事件是非常简单的。使用了两个关键的方法:
* setTimeout() - executes a code some time in the future
在一些时间后执行代码
* clearTimeout() - cancels the setTimeout()
取消setTimeout()
Note: The setTimeout() and clearTimeout() are both methods of the HTML DOM Window object.
注意:setTimeout() 和 Timeout() 都是HTML DOM Window 对象的方法。
setTimeout()
Syntax语法
var t=setTimeout("javascript statement",milliseconds)
The setTimeout() method returns a value - In the statement above, the value is stored in a variable called t. If you want to cancel this setTimeout(), you can refer to it using the variable name.
setTimeout()方法返回一个值 - 在上面的声明里,值被保存在变量t中。如果你想取消这个setTimeout()可以使用变量名来提出它(用clearTimeout(t))
The first parameter of setTimeout() is a string that contains a JavaScript statement. This statement could be a statement like "alert('5 seconds!')" or a call to a function, like "alertMsg()".
setTomeout()的第一个参数是字符串声明。它可以像"alert('5 seconds!')"或是调用一个函数像"alertMsg()"
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