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How to use loop in js?
- PHP中文网Original
- 2017-06-21 09:33:221152browse
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)//92. for in loop
Used to loop a
object ='小李'18'170cm''敲代码'
for(var key in object){
console.log(key);// The attribute name obtained in each loop
Console.log(object[key])// Obtaining the attribute value in for in can only be obtained through the object name[key] and cannot write obj.key
}
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)
Document
- 11111111111111111111111111
- 22222222222222222222222222
- 33333333333333333333333333
- 44444444444444444444444444
- 55555555555555555555555555
- 66666666666666666666666666
- 11111111111111111111111111
- 22222222222222222222222222
- 33333333333333333333333333
- 44444444444444444444444444
- 55555555555555555555555555
- 66666666666666666666666666
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