js for loop output i is the same value problem

1. I recently encountered a problem during development, why is the output always 5, instead of clicking on each p, the corresponding 1, 2, 3, 4, 5 will be alerted.

The code is as follows:

    
  
1
 
2
 
3
 
4
 
5
   

At this time, click on any p and the pop-up will be 5

Reason:js event processor will not run during the idle time of the thread, resulting in the final run time What is output is the last value of i, that is: 5

2. Solution: Use closure to protect the value of variable i.

//sava1:加一层闭包，i以函数参数形式传递给内层函数 for( var i=0; i
        

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