代码
<html>
<head>
<title>javascript</title>
<script type="text/javascript">
function test(inVal){
try{
inVal=inVal.toUpperCase();
}catch(error){
alert("An exception has occurred.Error was:\n\n"+error.message);
}
}
</script>
</head>
<body>
<input type="button" value="Test" onclick="test(null);">
</body>
</html>
<html>
<head>
<title>javascript</title>
<script type="text/javascript">
function test(inVal){
try{
inVal=inVal.toUpperCase();
}catch(error){
alert("An exception has occurred.Error was:\n\n"+error.message);
}
}
</script>
</head>
<body>
<input type="button" value="Test" onclick="test(null);">
</body>
</html>
利用firefox的firebug来调bug
引用
<html>
<head>
<title>javascript</title>
<script type="text/javascript">
function test(){
var a=0;
console.log("checkpoint 1");
a=a+1;
console.log("checkpoint 2");
a=a-1;
console.log("checkpoint 3");
a=a.toLowerCase();
console.log("checkpoint 4");
}
</script>
</head>
<body>
<input type="button" value="Test" onclick="test(null);">
</body>
</html>
在IE中可以添加一个方法
引用
function Console(){
this.log=function(inText){
alert(inText);
}
}
var console=new Console();
