<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<script>
var a = 'hello'
var b = 'aaa'
alert(a=b)
</script>
</body>
结果：报错？正确？请自行尝试（java同理）
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<script>
var a = 'hello'
var b = 'aaa'
alert(a=b)
</script>
</body>
结果：报错？正确？请自行尝试（java同理）