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JS对象 - this - 原型 - 可迭代器 - Symbol - 继承

Usually a method needs to do something with the object it was called on. When a function is called as a method—looked up as a property and immediately called, as in object.method()—the binding called this in its body automatically points at the object that it was called on.

2021-08-24

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let str = a\nb; console.log(str); console.log(typeof str); function foo1(){ console.log('ex1'); } function foo2(){ console.log('ex2'); return 2; } console.log(foo1() || foo2()); // console.log(foo() && false); // console.log(0 && foo()); /* The || op

2021-08-24

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正则表达式

正则表达式 javascript

If you’re thinking in terms of object-oriented programming, your first impulse might be to start defining objects for the various elements in the world: a class for the robot, one for a parcel, maybe one for places. These could then hold properties that describe their current state, such as the pile of parcels at a location, which we could change when updating the world.

2021-08-24

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Promise对象用于呈现异步操作事件的完成/失败结果。此篇文章翻译自Promise,原文章太长，因此自己在这里做了简化，以便自己加强认识和理解。实际上Promise的用法非常简单，自己不太理解的只是then() finally() catch()在链式调用时缺省回调函数的情况

2021-07-30

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