||在JavaScript中 [英] || in javascript
本文介绍了||在JavaScript中的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
有人可以告诉我什么吗||在这里做
Can somebody please tell me what || this doing here
(function()
{
window.myapp = window.myapp || {};
window.myapp.lang = window.myapp.lang || {};
myapp.lang.Extend = function(subClass, superClass)
{
subClass.prototype = new superClass();
};
})();
推荐答案
window.myapp = window.myapp || {};
这意味着:如果不存在window.myapp,则将其创建为空对象.
It means: create window.myapp as an empty object if it does not already exist.
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