is link[i].onclick = Why are the two brackets ()() used together? How to understand?
link[i].onclick =
As shown below:
Please tell me! Thanks!
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Assumption:
var test = function(i) { return function() { alert(i+1); } }
So your above line can also be written like this:
links[i].onclick = test(i);
The first bracket is to wrap the function name, and the second bracket is to indicate the method parameters
Self-executing function, indicating that it directly points to the content of function return.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Assumption:
So your above line can also be written like this:
The first bracket is to wrap the function name, and the second bracket is to indicate the method parameters
Self-executing function, indicating that it directly points to the content of function return.