解决JavaScript代码报错：Uncaught SyntaxError: Unexpected end of input
<!DOCTYPE html>
<html>
<head>
<script>
window.onload = function(){
if(Number(top1.value)+Number(top2.value) == top3.value){
alert('您已经成功了');
}else{
alert('你彻底失败了');
}
}
</script>
<meta charset="UTF-8" />
<title>title</title>
</head>
<body>
<input type="" name="">
<input type="button" name="" value="+" id="top1">
<input type="" name="">
<input type="button" name="" value="=" id="top2">
<input type="" name="" id="top3">
<br>
<input type="" name="">
<input type="button" name="" value="+" id="top4">
<input type="" name="">
<input type="button" name="" value="=" id="top5">
<input type="" name="">
<br>
<input type="button" name="" value="查询结果">
</body>
</html>
<p>这段代码缺少一个大括号，需要在if语句的后面添加一个大括号来匹配if语句的开始。修改后的代码如下：</p>
<!DOCTYPE html>
<html>
<head>
<script>
window.onload = function(){
if(Number(top1.value)+Number(top2.value) == top3.value){
alert('您已经成功了');
}else{
alert('你彻底失败了');
}
}
</script>
<meta charset="UTF-8" />
<title>title</title>
</head>
<body>
<input type="" name="">
<input type="button" name="" value="+" id="top1">
<input type="" name="">
<input type="button" name="" value="=" id="top2">
<input type="" name="" id="top3">
<br>
<input type="" name="">
<input type="button" name="" value="+" id="top4">
<input type="" name="">
<input type="button" name="" value="=" id="top5">
<input type="" name="">
<br>
<input type="button" name="" value="查询结果">
</body>
</html>
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