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4. Firebug 调试 Js

2015-10-09 22:50 681 查看

<html>
<head>
<meta Content-Type="text/html" charset="utf-8"/>
<title>演示js调试</title>
<style>
<h1{
font-size: 50px;
text-align: center;
}
</style>
</head>

<body>

<h1>倒计时：<span>10</span></h1>
<script src="http://code.jquery.com/jquery-latest.js"></script>

<script>
$(document).ready(function(){
var e1 = $("h1 span").first();
var i = 9;

var interval = setInterval(function(){
e1.html(i);
i--;
console.log(i);
console.info(i);
console.debug(i);
console.error(i);
console.warn(i);
if(i<=0){
clearInterval(interval);
}
},1000);
});
</script>

</body>
</html>