javascript实现点我加一
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>点我加一
</title>
<script type="text/javascript">
function add(){
var num=document.getElementById("num");
num.value=parseInt(num.value)+1;
}
</script>
</head>
<body>
<input type="text" id="num" value="0"/>
<input type="button" value="点我加一" onclick="add()"/>
</body>
</html>
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