<body>??
<p>?arguments.length?屬性返回函數接收到參數的個數：</p>???
<p?id="demo"></p>
<script>????
function?myFunction(a,?b)?{//傳給函數的參數超出范圍卻不報錯????????
????return?arguments.length;???
?}????
document.getElementById("demo").innerHTML?=?myFunction(4,?3,?2,?1);???
</script>
</body>
js怎么才能報錯？
錯過了年華
2018-08-10 10:22:45
