最后执行finally
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<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>最后执行finally</title>
<!--
finally{a}
解读：不论之前是否发生错误，错误是否被处理，最后都要执行代码a
-->
</head>
<body>
<script>
var a=1;
try{
throw "我是错误提示";//自定义error massage
}
catch (b){
console.log(b);//catch()捕获error name=b，b容纳了throw定义的error massage
}
finally{
console.log("不管前面的对错，反正最后我都要执行");//不论前面怎样，最后都要执行的代码
}
</script>
</body>
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