Js supplemented with small knowledge points (continue, break, ruturn) and continueruturn

Js supplemented with small knowledge points (continue, break, ruturn) and continueruturn

1. continue, break, ruturn

Eg: sum of 1-

$(function (){    $("#hello").click(function ()    {        var iNum = 0;        for (var i = 1; i < 101; i++)        {            iNum += i;        }        alert(iNum);    });});

Result: 5050

Change to break to view the result.

$(function (){    $("#hello").click(function ()    {        var iNum = 0;        for (var i = 1; i < 101; i++)        {            if (i == 5)            {                break;            }            iNum += i;        }        alert(iNum);    });});

Result: 10

 

Conclusion 1: break: jumps out of the entire loop body.

Change to continue and check the result?

 1 $(function () 2 { 3     $("#hello").click(function () 4     { 5         var iNum = 0; 6         for (var i = 1; i < 101; i++) 7         { 8             if (i == 5) 9             {10                 continue;11             }12             iNum += i;13         }14         alert(iNum);15     });16 });

 

Result: 5045, (all except 5)

Conclusion 2: continue skips the cycle of the current condition.

Return can be used in either of the following ways:

The first method is to convert it to return to see the result?

The result is: no result. return ends the method body and directly jumps out of the method body, so it cannot be printed.

The second method of return: a method that returns a value

1 $ (function () 2 {3 $ ("# hello "). click (function () 4 {5 var iNum = 0; 6 for (var I = 1; I <101; I ++) 7 {8 if (I = 5) 9 {10 I = A (I); 11} 12 iNum + = I; 13} 14 alert (iNum); 15 }); 16 // The second method of return is to return A value 17 function A (I) 18 {19 I + = 5; 20 return I; 21} 22 });

 

Result: 5015

Process Analysis:

 

Conclusion 3: return is used. The first method ends the whole body, and the second method returns a value.