Are there any possibilities to use "goto" inside switch statement in javascript? - Stack Overflow

admin管理员组

文章数量:1360325

This is my example program in JS. I have to iterate or loop inside the switch statement. So I have used goto, but it doesn't working.

Are there any other options to loop this or is my syntax wrong?

var input = 1;
switch (input)
{
    case 1: 
        ...
        break;
    case 2: 
        ...
        break;
    case 3: 
        ...
        if (..) { }
        else    
        {
            goto case 2;
        }
        break;
    default: 
        alert("No Return");
        break;
}

This is my example program in JS. I have to iterate or loop inside the switch statement. So I have used goto, but it doesn't working.

Are there any other options to loop this or is my syntax wrong?

var input = 1;
switch (input)
{
    case 1: 
        ...
        break;
    case 2: 
        ...
        break;
    case 3: 
        ...
        if (..) { }
        else    
        {
            goto case 2;
        }
        break;
    default: 
        alert("No Return");
        break;
}

• javascript
• switch-statement
• goto

Share Improve this question Follow edited Nov 21, 2015 at 13:07 user663031 asked Nov 21, 2015 at 4:24 Goutham SelvarajGoutham Selvaraj 10311 gold badge22 silver badges99 bronze badges 4

• 1 Even if this were possible, case 2 was already false, so it will be false again. Explain, specifically, what you are trying to acplish--i.e. what are you test for true? – Cory Commented Nov 21, 2015 at 4:27
• i have added the same goto case 2 in case 1:..But Still not working – Goutham Selvaraj Commented Nov 21, 2015 at 4:29
• 1 There is no GOTO in JS. Maybe you are looking for case fallthrough: javascript.about./od/hintsandtips/a/fallthrough.htm – Cory Commented Nov 21, 2015 at 4:33
• This code has nothing to do with jQuery. – Regent Commented Nov 21, 2015 at 5:21

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 4

Are there any possibilities to use "goto" inside switch statement in javascript?

No, there are no possibilities to use "goto" inside switch statement, or anywhere else, since JavaScript has no such statement.

To solve your problem, as suggested in a ment, organize your cases (moving 3 above 2) so you can use fall-through:

var input = 1;
switch (input)
{
    case 1: 
        ...
        break;
    case 3: 
        ...
        if (..) { ...; break; }
        // fall through to case 2
    case 2: 
        ...
        break;
    default: 
        alert("No Return");
        break;
}

In this case, make sure to ment the fall-through so people looking at your code don't think it's a bug. You may also need to add a hint so that your linter does not plain.

Or, just put the logic mon to 2 and 3 in a little function:

function someLogicFor2Or3() { ... }

    case 2: 
        someLogicFor2OrMaybe3();
        break;
    case 3: 
        ...
        if (..) { }
        else someLogicFor2OrMaybe3();
        break;

I have used the following technique to do this :

var input = 1;
while (1) {
  switch (input) {
  case 1: 
    ...
    break; // switch

  case 2: 
    ...
    break; // switch

  case 3: 
    ...
    if (..) { }
    else {
      input = 2; // goto case 2;
      continue;  // while
    }
    break; // switch

  default: 
    alert ("No Return");
    break;  // switch
  }
  break;  // while
}

本文标签： Are there any possibilities to use quotgotoquot inside switch statement in javascriptStack Overflow