Javascript:如何调用外部函数的返回值?

I have such code:

我有这样的代码:

function allValid() {
    $('input').each(function(index) {
        if(something) {
            return false; 
        }    
    });

    return true;

}

which always returns true as return false; affects anonymous inner function. Is there an easy way to call outer function's return?

它总是返回true作为返回false;影响匿名内部的功能。是否有一种简单的方法来调用外部函数的返回值?

PS. I am not looking for a workaround, just want to know the answer to original question. If the answer is "not possible" it is fine.

我并不是在寻找解决办法，我只是想知道原始问题的答案。如果答案是“不可能”，那也可以。

4 个解决方案

#1

Yeah, store it in a local variable.

将它存储在一个局部变量中。

function allValid() {
  var allGood = true;
  $('input').each(function (index) {
    if (something) {
      allGood = false;
    }
  });

  return allGood;
}

#2

You can also do this with filter:

你也可以用过滤器来做:

var anyInvalid = $('input').filter(function(index) {
                   if(inValidCheck)
                     return true;
                 }).length;

This works because 0 is treated as false, but it actually gives you the number of invalid, which you could use this to display "You have 3 invalid entries" or something if you wanted.

这是有效的，因为0被认为是假的，但是它实际上给了你无效的数字，你可以用它来显示“你有3个无效的条目”或者其他你想要的东西。

#3

If you want to do this efficiently, I think this is the best way:

如果你想高效地做到这一点，我认为这是最好的方法:

function allValid() {
  elements = $('input')
  for (i = 0; i < elements.length; i++) { invalidityCheck(elements[i]) && return false; }
  return true;
}

Edit: Although a more JavaScript-y version would probably use exceptions:

编辑:虽然更多的javascript版本可能会使用异常:

function allValid() {
  try
    $('input').each(function(index)) {
      if (something) { throw 'something happened!'; }
    });
  catch (e) {
    if (e == 'something happened!') {
      return false;
    } else {
      throw e;
    }
  }
  return true;
}

#4

You could also use Array.prototype.some which iterates until finding an element that matches the criteria.

你也可以使用Array.prototype。一些迭代，直到找到匹配条件的元素。

function allValid() {
    var inputs = $('input');
    if(inputs.toArray().some(function(input){
        if(something)
            return true;
    })) {
        return false;
    } else {
        return true;
    }
}

#1