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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>无穷循环的计时事件</title>
</head>
<body>
<form>
<input type="button" value="开始计数!" onclick="doTimer()">
<input type="text" id="txt">
</form>
<p>
单击按钮,输入框就从0开始一直计数。
</p>
</body>
</html>
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var c = 0;
var t;
var timer_is_on = 0;
function timedCount() {
document.getElementById('txt').value = c;
c = c + 1;
t = setTimeout("timedCount()", 1000);
}
function doTimer() {
if(!timer_is_on) {
timer_is_on = 1;
timedCount();
输入 CSS 代码……