PHP检查当前时间是否少于特定时间(PHP Check if the current time is less than a specific time)

 .bind()适用于函数。 它只是没有你认为它做的。 
 
 看，函数也是对象。 像对象一样对待它们并不意味着它们会被调用。 
 
function a() { console.log("a was called"); }
function b() { console.log(this); }

var bound = b.bind(a);
bound();  // logs "function a() { }" in my console
 
 在你的情况下，一旦你将test绑定到another ，你有一个新的功能，就像test一样，但这意味着another ，因此this.var意味着another this.var 。 所有这一切都发生在没有another 被调用的情况下。 
 
 我不确定你的代码是如何工作的，因为它没有多大意义。 但是如果你在运行之后检查一下，你会发现'test123'现在的值为'test123' 。 
 
 即使你事先说过another() ，也没关系。 首先，因为another不受任何约束，所以对它来说， this意味着全局对象。 在浏览器中， another()基本上只是设置window.var 。 但其次， test设置了自己的值 - 所以即使两个函数对this.var含义有相同的想法， test也会用'test123'覆盖它。 

.bind() works just fine for functions. It just doesn't do what you think it does.
 
See, functions are objects too. And treating them like objects doesn't mean they get called.
 
function a() { console.log("a was called"); }
function b() { console.log(this); }

var bound = b.bind(a);
bound();  // logs "function a() { }" in my console
 
In your case, once you've bound test to another, you have a new function that works just like test, but where this means another, and thus this.var means another.var. And all of this happens without another ever getting called.
 
I'm not sure entirely how you expect your code to work, cause it doesn't make much sense as it stands. But if you were to examine things after you run it, you would find that another.var now has the value 'test123'.
 
Even if you said another() beforehand, it wouldn't matter. Firstly because another isn't bound to anything, so to it, this means the global object. In a browser, another() would basically just be setting window.var. But secondly, test sets its own value -- so even if both functions had the same idea of what this.var means, test would overwrite it with 'test123'.