<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, 存在继承关系的两个类,父类引用指向子类对象,用子类的对象去判断是不是父类类型时 肯定是true,子类引用不可以指向父类对象。哈哈
2018-05-12