Solution to the problem of setTimeout in javascript_javascript skills

I saw a problem that probably looked like this.

Copy code The code is as follows:

name = 'out of you'
foo = function(){
this.name = 'xxoo';
}
foo.prototype.say = function(){
console.log(this.name);
}
f = new foo();
f.say(); // This sentence will output xxoo
setTimeout(f.say, 500); // This sentence will output out of you

This is a pitfall. JavaScript's this is generated when it is called, and it is also related to the context. This is how to solve it. I tested it and used call.

Copy code The code is as follows:

setTimeout.call(foo(), f.say, 500)

Some solutions on the Internet

This points to the problem of setTimeout in js

Using Timer in JavaScript

In the end, it’s still a matter of understanding this.

I can continue writing when I understand it better one day