[英]stop function that run with setTimeout
我想停止使用setTimeout運行的函數,並且不顯示跟隨鼠標的圖像。 我想通過單擊按鈕做到這一點,怎么辦? 我的代碼:
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
<script type="text/javascript">
var trailimage = ["test.gif", 100, 99];
var offsetfrommouse = [-25, -25];
var displayduration = 0;
function truebody() {
return (!window.opera && document.compatMode && document.compatMode != "BackCompat") ? document.documentElement : document.body;
}
function hidetrail() {
var x = document.getElementById("trailimageid").style;
x.visibility = "hidden";
document.onmousemove = "";
}
function followmouse(e) {
var xcoord = offsetfrommouse[0];
var ycoord = offsetfrommouse[1];
if (typeof e != "undefined") {
xcoord += e.pageX;
ycoord += e.pageY;
}
else if (typeof window.event != "undefined") {
xcoord += truebody().scrollLeft + event.clientX;
ycoord += truebody().scrollTop + event.clientY;
}
var x = document.getElementById("trailimageid").style;
x.left = xcoord + "px";
x.top = ycoord + "px";
}
alert("obj_selected = true");
document.onmousemove = followmouse;
if (displayduration > 0)
setTimeout("hidetrail()", displayduration * 1000);
</script>
</head>
<body>
<form id="form1" runat="server">
<img alt="" id="trailimageid" src="Pictures/sides/sides-not-clicked.gif" border="0" style="position: absolute; visibility: visible; left: 0px;
top: 0px; width: 50px; height: 50px"/>
</form>
</body>
</html>
var foobarTimeout = setTimeout(foobar, 1000);
...
clearTimeout(foobarTimeout);
看到:
https://developer.mozilla.org/en/DOM/window.setTimeout
https://developer.mozilla.org/en/DOM/window.clearTimeout
保存setTimeout
的返回值,該值是計時器的“句柄”,並且要取消它時,請使用該值調用clearTimeout
。
因此,在您的代碼中,您將在適當的位置聲明一個timerHandle
變量,然后在此處進行設置:
if (displayduration > 0)
timerHandle = setTimeout("hidetrail()", displayduration * 1000);
...然后創建按鈕click
處理程序:
function cancelTimeoutOnClick() {
if (timerHandle) {
clearTimeout(timerHandle);
timerHandle = 0;
}
}
離題 :將字符串傳遞到setTimeout
幾乎從來不是最佳實踐,這是一個隱式的eval
。 在您的情況下,只需傳遞函數引用即可:
if (displayduration > 0)
timerHandle = setTimeout(hidetrail, displayduration * 1000);
// ^--- Difference here (no quotes, no parentheses)
您使用超時>
var myTimeout = setTimeout(yourfunction);
然后您可以取消它>
clearTimeout(myTimeout);
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