<script type="text/javascript">
var arr = new Array(3)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"
document.write(arr + "<br />")
document.write(arr.push("James") + "<br />")
document.write(arr)
</script>
var arr = new Array(3)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"
document.write(arr + "<br />")
document.write(arr.push("James") + "<br />")
document.write(arr)
</script>
2018-05-21
instanceof 很好理解啊, 存在繼承關系的兩個類,父類引用指向子類對象,用子類的對象去判斷是不是父類類型時 肯定是true,子類引用不可以指向父類對象。哈哈
2018-05-12