<html>
<head><title>demo
</title>
<script>
function dis(na){
alert(na.value);
}
</script>
</head>
<body>
<form name="f1">
<input type="text" name="he" value="hello" onclick="dis(this)"></form>
</body>
</html>
<head><title>demo
</title>
<script>
function dis(na){
alert(na.value);
}
</script>
</head>
<body>
<form name="f1">
<input type="text" name="he" value="hello" onclick="dis(this)"></form>
</body>
</html>
<head><title>demo
</title>
<script>
function dis(na){
alert(eval("document.f1."+na+".value));
}
</script>
</head>
<body>
<form name="f1">
<input type="text" name="he" value="hello" onclick="dis('he')"></form>
</body>
</html>
alert(na.value);
}HTML:
<input type="text" name="he" value="hello" onclick="dis(this)">
在这儿，this表示这个html对象的引用