How to use loop in js?

1. for loop

Four steps:

1. Set the initial value var i = 0

　2. Set the loop execution condition i < 5

　3. Execute the content in the loop body {[loop body]} wrapped part

　4. After each round of loop, our i++ accumulation operation is executed

for(var i = 0;i<5;i++){
    console.log(i)
}

　break/continue: in the loop When these two keywords are encountered in the body, the subsequent code in the loop body will no longer be executed

Break: In the loop body, if break appears, the entire loop will end directly , the last cumulative operation of i++ is not executed either

Continue: In the loop body, if continue appears, the current round of the loop ends and the next round of loop continues. , i++ continues to execute　

for(var i = 0;i<10;i++){if(i<=5){
        i+=2;continue;
    }
    i+=3;break;
    console.log(i)//不执行}

console.log(i)//9

2. for in loop

Used to loop a

 object ='小李'18'170cm''敲代码'

Case: changing the color of every other row in the table (the ternary operator satisfies the condition and if there are multiple executions, you can add parentheses and separate them with commas)

    
    
    



    

        

            
11111111111111111111111111
            
22222222222222222222222222
            
33333333333333333333333333
            
44444444444444444444444444
            
55555555555555555555555555
            
66666666666666666666666666
            
11111111111111111111111111
            
22222222222222222222222222
            
33333333333333333333333333
            
44444444444444444444444444
            
55555555555555555555555555
            
66666666666666666666666666
        
    
    

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