关于定时器
为什么点一下按钮，文本框的数字就只加一；；而我要效果是点一下按钮，文本框内容就从0开始自动计数，请问哪里写错了？？？？？？
2 回答
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>计时器</title>
</head>
<script>
window.onload=function ()
{
var oTxt1=document.getElementById("txt1");
var oBtn1=document.getElementById("btn1");
var num=0;
oBtn1.onclick=function tt()
{
var time=setTimeout(function(){
num++;
oTxt1.value=num;
setTimeout(tt(),0);
},1000);
}
}
</script>
</head>
<body>
<form>
<input id="txt1" type="text" />
<input id="btn1" type="button" value="点击" />
</form>
</body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>计时器</title>
</head>
<script>
window.onload=function ()
{
var oTxt1=document.getElementById("txt1");
var oBtn1=document.getElementById("btn1");
var num=0;
oBtn1.onclick=function tt()
{
var time=setTimeout(function(){
num++;
oTxt1.value=num;
setTimeout(tt(),0);
},1000);
}
}
</script>
</head>
<body>
<form>
<input id="txt1" type="text" />
<input id="btn1" type="button" value="点击" />
</form>
</body>
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