在javascript中执行回发之前的延迟

我现在唯一能想到的办法就是延迟3秒回发，就是这样

setInterval("__doPostBack('UpdatePanel1', '' )", 3000); 

我遇到的问题是，它每3秒就发回一次。是否有更好的方法来执行此操作或清除此操作的间隔？我正在使用asp updatepanel控件

下面是我的完整javascript代码，让您了解我正在尝试做什么：

    var delayb4scroll = 1000 //Specify initial delay before marquee starts to scroll on page (2000=2 seconds)
    var marqueespeed = 2 //Specify marquee scroll speed (larger is faster 1-10)
    var pauseAtBottom = 3000 //Pause at the end of the scroll for this many seconds (3000 = 3 seconds)
    var copyspeed = marqueespeed
    var actualheight = ''
    var boolRunOnce = ''

    function pageLoad() {
        initializemarquee();
    }

    function scrollmarquee() {
        if (parseInt(cross_marquee.style.top) - 975 > (actualheight * (-1) + 8)) //if scroller hasn't reached the end of its height
            cross_marquee.style.top = parseInt(cross_marquee.style.top) - copyspeed + "px" //move scroller upwards
        else { //else, scrollbar has reached the bottom, display for 3 seconds then postback
            setInterval("__doPostBack('UpdatePanel1', '' )", 3000);        
        }
    }

    function initializemarquee() {
        cross_marquee = document.getElementById("vmarquee")
        cross_marquee.style.top = 0
        marqueeheight = document.getElementById("marqueecontainer").offsetHeight
        actualheight = cross_marquee.offsetHeight //height of marquee content (much of which is hidden from view)       
        setTimeout('lefttime=setInterval("scrollmarquee()",30)', delayb4scroll)
    }

将只运行一次

或者您可以使用setInterval的返回值作为对interval线程的引用，然后可以清除该线程

myInterval = setInterval(function() { __doPostBack('UpdatePanel1', '' ); }, 3000);
//later
clearInterval(myInterval);

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编辑：正确，根据注释添加了函数语法。

尝试setTimeout，与setInterval类似，但只运行一次。注意：不要将字符串传递给

setTimeout

/

setInterval

；它使用

eval

！传递函数：

setInterval（函数（）。我做了更改，但它似乎在调试模式下一次又一次地调用updatepanels方法，而不是只调用一次。
myInterval = setInterval(function() { __doPostBack('UpdatePanel1', '' ); }, 3000);
//later
clearInterval(myInterval);