Question

我有html的这一部分：

<h1 class="gr-title uppercase">
<span class="title-red">GET MORE</span> 
<span id="wordSwap" class="title-black">PROFITS</span>
</h1>

...这个jquery代码用ID wordSwap改变了span的值：

(function(){

    //Words:
    var words = [
    'Profits',
        'Freedom',
        'Time',
        'Enjoyment',
        'Disconnection',
        'Value'
        ], i = 0;

    setInterval(function(){
        $('#wordSwap').fadeOut(function(){
            $(this).html(words[i=(i+1)%words.length]).fadeIn();
        });
       // 2 second interval
    }, 2000);

})();

我正在尝试根据接下来的值/单词更改数组中每个值的letter-spacing，但是我被卡住了，无法让它工作。例如，我希望单词“Time”的字母间距= 30px，单词“Value”20px，依此类推。我怎么能这样做？

以下是我现在所做的事情：https://jsfiddle.net/vgum6jn6/

//Swap words effect
(function() {

  // List of words:
  var words = [
    'Profits',
    'Freedom',
    'Time',
    'Enjoyment',
    'Disconnection',
    'Value'
  ], i = 0;

  setInterval(function() {
    $('#wordSwap').fadeOut(function() {
      $(this).html(words[i = (i + 1) % words.length]).fadeIn();
    });
    // 2 seconds
  }, 2000);

})();

.gr-title {
  font-family: "Arial", Georgia, Serif;
}

.uppercase {
  text-transform: uppercase;  
}

.title-red {
  color: #CB0000;
}

.title-black {
  color: #191919;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>

<h1 class="gr-title uppercase">
  <span class="title-red">GET MORE</span> <span id="wordSwap" class="title-black">PROFITS</span>
</h1>

Answer 1

尝试这样的事情：

var baseWidth = 100; //some value
setInterval(function(){
    $('#wordSwap').fadeOut(function(){
        $(this).html(words[i=(i+1)%words.length]).fadeIn()
          .css('letter-spacing','') //reset spacing
          .css('letter-spacing', function(){
                var ratio = baseWidth / $(this).prop('offsetWidth');
                return ratio + 'px';
               });
    });
   // 2 second interval
}, 2000);

Answer 2

Alex Kudryashev帮助我提出了这个问题，它完美地解决了我的问题：

             //Swap words effect:
            var words = [
                { word: 'Profits', spacing: '8px' },
                { word: 'Enjoyment', spacing: '0px' },
                { word: 'Freedom', spacing: '4px' },
                { word: 'Disconnection', spacing: '-2px' },
                { word: 'Time', spacing: '0.98em' },
                { word: 'Value', spacing: '0.5em' }
                ], i = 0, n = 0;

            setInterval(function () {
                $('#wordSwap').fadeOut(function () {
                    $(this).html(words[i = (i + 1) % words.length].word)
                    .css('letter-spacing', words[n = (n + 1) % words.length].spacing).fadeIn();
                });
                // 2 seconds
            }, 2000);

（忽略随机字母间距值，它们随机用于测试目的）

根据数组中的值动态更改CSS

2 个答案: