Javascript: setTimeout()使用及 setInterval()使用

﹏ヽ暗。殇╰゛Y 2022-09-27 03:56 133阅读 0赞

Evaluates an expression after a specified number of milliseconds has elapsed.

(在指定时间过后执行指定的表达式)

Syntax:

*iTimerID = window.setTimeout(vCode, iMilliSeconds \[, sLanguage\])*

*Parameters*

> <table> 
>  <tbody> 
>   <tr> 
>    <td><em>vCode</em> </td> 
>    <td>Required. Variant that specifies the function pointer or string that indicates the code to be executed when the specified interval has elapsed.</td> 
>   </tr> 
>   <tr> 
>    <td><em>iMilliSeconds</em> </td> 
>    <td>Required. Integer&nbsp;that specifies the number of milliseconds.</td> 
>   </tr> 
>   <tr> 
>    <td><em>sLanguage</em> </td> 
>    <td>Optional. String&nbsp;that specifies one of the following values: 
>     <table> 
>      <tbody> 
>       <tr> 
>        <td><span>JScript</span> </td> 
>        <td>Language is JScript.</td> 
>       </tr> 
>       <tr> 
>        <td><span>VBScript</span> </td> 
>        <td>Language is VBScript.</td> 
>       </tr> 
>       <tr> 
>        <td><span>JavaScript</span> </td> 
>        <td>Language is JavaScript.</td> 
>       </tr> 
>      </tbody> 
>     </table> </td> 
>   </tr> 
>  </tbody> 
> </table>

*Return Value*

> *Integer. Returns an identifier that cancels the evaluation with the [clearTimeout][] method.*
> 
> *==============================================================*
> 
>  
> 
>   
>    
> 
> 
> \-------------------------------------------------------------------  
> setTimeout( alert("3秒种过去了"), 3000);//调用一个函数,允许带常量参数  
> \-------------------------------------------------------------------
> 
>

> <mce:script language="Javascript"></mce:script>  
>

>   
>

> setInterval()的用法和setTimeout()是一样的:
> 
>     iTimerID = window.setInterval(vCode, iMilliSeconds [, sLanguage])
> 
> 不同的是setTimeout()是一次性作用,而setInterval()是每隔*iMilliSeconds* 就执行一次*vCode.(* Evaluates an expression each time a specified number of milliseconds has elapsed)

[clearTimeout]: http://hi.baidu.com/test/blog/item/69fa1a4cce6feff9d72afc07.html