weixin_39567169的博客(整理中)在 python 中,类型属于对象,变量是没有类型的:a=[1,2,3]a="Runoob"以上代码中,[1,2,3]是 List 类型,"Runoob"是 String 类型,而变量 a 是没有类型,她仅仅是一个对象的引用(一个指针),可以是 List ...
拍死双马的博客JavaScript OR(||)变量赋值说明给出这段JavaScript代码......var a;var b = null;var c = undefined;var d = 4;var e = 'five';var f = a || b || c || d || e;alert(f); // 4有人可以向我解释一下这种技术的用途(我...
柯布西耶的博客Imagine that you need to write some Javascript that simply changes a set of checkboxes when a drop down list is changed.Depending on which item is selected in the list, some of the checkboxes will bec...