为什么我不能在 for 循环中使用这个变量？

Question

So I am having an issue with running the loop for this function. It does not appear I can use var formappend in the for loop, even though my var formappend returns a number to the console when I input a number into the form.

var formappend = $('input[name=inputform]').val();
  for (var i = 0; i < formappend; i++){
      $('button').one('click', function(i) {
            var newblock = $("<div class='block'></div>").text("");
            $('#funbox').append(newblock);
                });
  }

Thanks

Answer 1

formappend is not an integer, it's a string after it's returned from this call:

$('input[name=inputform]').val();

Try calling parseInt() on the result like this:

var formappend = parseInt($('input[name=inputform]').val());

Also, I think you meant to call the .on method, not the .one method on your button

Answer 2

First of all, you need to run 'for' loop inside the click handler. Currently you bind a click handler inside a 'for' loop, so try this:

$('button').on('click', function(i) {
    $('#funbox').text('');
    var formappend = parseInt($('input[name=inputform]').val());
    if(isNaN(formappend)) return false;

    for (var i = 0; i < formappend; i++){      
        var newblock = $("<div class='block'></div>").text("");
        $('#funbox').append(newblock);
    }
});

Check this out: https://jsfiddle.net/s24edozb/5/