“将” jQuery“转换为普通JavaScript”

时间：2019-02-11 09:53:05

标签： javascript jquery html css

我正在尝试制作某种类似于THIS代码库中的页面加载器的页面加载器。 让我感到困扰并试图自行解决的是使用某种我认为是jQuery命令的美元符号（$）。 我试图用纯JavaScript编写代码，但是代码无法正常工作（因为我想弄乱了某些东西） 以下是带有jQuery的JavaScript和纯Javascript（我制作的）：

带有JavaScript和jQuery片段的原始代码

$(document).ready(function() {
  var counter = 0;

  // Start the changing images
  setInterval(function() {
    if(counter == 9) { 
      counter = 0; 
    }

    changeImage(counter);
    counter++;
  }, 3000);

  // Set the percentage off
  loading();
});

function changeImage(counter) {
  var images = [
    '<i class="fa fa-fighter-jet"</i>',
    '<i class="fa fa-gamepad"></i>',
    '<i class="fa fa-headphones"></i>',
    '<i class="fa fa-cubes"></i>',
    '<i class="fa fa-paw"></i>',
    '<i class="fa fa-rocket"></i>',
    '<i class="fa fa-ticket"></i>',
    '<i class="fa fa-pie-chart"></i>',
    '<i class="fa fa-codepen"></i>'
  ];

  $(".loader .image").html(""+ images[counter] +"");
}

function loading(){
  var num = 0;

  for(i=0; i<=100; i++) {
    setTimeout(function() { 
      $('.loader span').html(num+'%');

      if(num == 100) {
        loading();
      }
      num++;
    },i*120);
  };

}
@import url(https://fonts.googleapis.com/css?family=Lato:100,300,400,700,900);

html,body {
  margin: 0;
  padding: 0;
  font-family:'Lato', sans-serif;
}
.loader {
  width: 100px;
  height: 80px;
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  margin: auto;
}
.loader .image {
  width: 100px;
  height: 160px;
  font-size: 40px;
  text-align: center;
  transform-origin: bottom center;
  -webkit-transform-origin: bottom center;
  -moz-transform-origin: bottom center;
  -ms-transform-origin: bottom center;
  animation: 3s rotate infinite;
  -webkit-animation: 3s rotate infinite;
  -moz-animation: 3s rotate infinite;
  -ms-animation: 3s rotate infinite;
  opacity: 0;
}
.loader span {
  display: block;
  width: 100%;
  text-align: center;
  position: absolute;
  bottom: 0;
}

@keyframes rotate{
  0% {
    transform: rotate(90deg);
    -webkit-transform: rotate(90deg);
    -moz-transform: rotate(90deg);
    -ms-transform: rotate(90deg);
  }
  10% {
    opacity: 0;
  }
  35% {
    transform: rotate(0deg);
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    opacity: 1;
  }
  65% {
    transform: rotate(0deg); 
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    opacity: 1;
  }
  80% {
    opacity: 0;
  }
  100% {
    transform: rotate(-90deg);
    -webkit-transform: rotate(-90deg);
    -moz-transform: rotate(-90deg);
    -ms-transform: rotate(-90deg);
  }
}
<link href="https://use.fontawesome.com/releases/v5.7.1/css/all.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="loader">
  <div class="image">
    <i class="fa fa-codepen"></i>
  </div>
  <span></span>
</div>

我的代码使用普通的JavaScript（我想还不太完整）

document.addEventListener("DOMContentLoaded", function() {
  var counter = 0;

  // Start the changing images
  setInterval(function() {
    if(counter == 4) { 
      counter = 0; 
    }
    changeImage(counter);
    counter++;
  }, 3000);
  // Set the percentage off
  loading();
});

function changeImage(counter) {
  var images = [
    '<i class="fa fa-cubes"></i>',
    '<i class="fa fa-rocket"></i>',
    '<i class="fa fa-pie-chart"></i>',
    '<i class="fa fa-codepen"></i>'
  ];

  document.getElementsByClassName("loader", "image").innerHTML = ("" + images[counter] + "");
}

function loading(){
  var num = 0;
  for(i=0; i<=100; i++) {
    setTimeout(function() { 
      document.getElementsByClassName("spaner").innerHTML= (num + '%');

      if(num == 100) {
        loading();
      }
      num++;
    },i*120);
  };
}
@import url(https://fonts.googleapis.com/css?family=Lato:100,300,400,700,900);

html,body {
  margin: 0;
  padding: 0;
  font-family:'Lato', sans-serif;
}
.loader {
  width: 100px;
  height: 80px;
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  margin: auto;
}
.loader .image {
  width: 100px;
  height: 160px;
  font-size: 40px;
  text-align: center;
  transform-origin: bottom center;
  -webkit-transform-origin: bottom center;
  -moz-transform-origin: bottom center;
  -ms-transform-origin: bottom center;
  animation: 3s rotate infinite;
  -webkit-animation: 3s rotate infinite;
  -moz-animation: 3s rotate infinite;
  -ms-animation: 3s rotate infinite;
  opacity: 0;
}
.loader span {
  display: block;
  width: 100%;
  text-align: center;
  position: absolute;
  bottom: 0;
}

@keyframes rotate{
  0% {
    transform: rotate(90deg);
    -webkit-transform: rotate(90deg);
    -moz-transform: rotate(90deg);
    -ms-transform: rotate(90deg);
  }
  10% {
    opacity: 0;
  }
  35% {
    transform: rotate(0deg);
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    opacity: 1;
  }
  65% {
    transform: rotate(0deg);
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    opacity: 1;
  }
  80% {
    opacity: 0;
  }
  100% {
    transform: rotate(-90deg);
    -webkit-transform: rotate(-90deg);
    -moz-transform: rotate(-90deg);
    -ms-transform: rotate(-90deg);
  }
}
<link href="https://use.fontawesome.com/releases/v5.7.1/css/all.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="loader">
  <div class="image">
    <i class="fa fa-codepen"></i>
  </div>
  <span class="spaner"></span>
</div>

任何帮助将不胜感激。

2 个答案:

答案 0 :(得分：4)

您的代码中几乎没有问题。

要使用多个选择器，可以尝试querySelector()：

document.querySelector(".loader .image").innerHTML = ("" + images[counter] + "");

getElementsByClassName()返回集合，您必须使用正确的索引：

document.getElementsByClassName("spaner")[0].innerHTML= (num + '%');

尝试以下操作：

document.addEventListener("DOMContentLoaded", function() {
  var counter = 0;

  // Start the changing images
  setInterval(function() {
    if(counter == 4) { 
      counter = 0; 
    }

    changeImage(counter);
    counter++;
  }, 3000);

  // Set the percentage off
  loading();
});

function changeImage(counter) {
  var images = [
    '<i class="fa fa-fighter-jet"</i>',
    '<i class="fa fa-gamepad"></i>',
    '<i class="fa fa-headphones"></i>',
    '<i class="fa fa-cubes"></i>',
    '<i class="fa fa-paw"></i>',
    '<i class="fa fa-rocket"></i>',
    '<i class="fa fa-ticket"></i>',
    '<i class="fa fa-pie-chart"></i>',
    '<i class="fa fa-codepen"></i>'
  ];

  document.querySelector(".loader .image").innerHTML = ("" + images[counter] + "");
}

function loading(){
  var num = 0;

  for(i=0; i<=100; i++) {
    setTimeout(function() { 
      document.getElementsByClassName("spaner")[0].innerHTML= (num + '%');

      if(num == 100) {
        loading();
      }
      num++;
    },i*120);
  };

}
@import url(https://fonts.googleapis.com/css?family=Lato:100,300,400,700,900);
html,body {
  margin: 0;
  padding: 0;
  font-family:'Lato', sans-serif;
}
.loader {
  width: 100px;
  height: 80px;
  position: absolute;
  top: 0; right: 0; left: 0; bottom: 0;
  margin: auto;
}
.loader .image {
  width: 100px;
  height: 160px;
  font-size: 40px;
  text-align: center;
  transform-origin: bottom center;
  animation: 3s rotate infinite;
  opacity: 0;
}
.loader span {
  display: block;
  width: 100%;
  text-align: center;
  position: absolute;
  bottom: 0;
}

@keyframes rotate{
  0% {
    transform: rotate(90deg);
  }
  10% {
    opacity: 0;
  }
  35% {
    transform: rotate(0deg);
    opacity: 1;
  }
  65% {
    transform: rotate(0deg);
    opacity: 1;
  }
  80% {
    opacity: 0;
  }
  100% {
    transform: rotate(-90deg);
  }
}
<link href="https://use.fontawesome.com/releases/v5.7.1/css/all.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="loader">
  <div class="image">
    <i class="fa fa-codepen"></i>
  </div>
  <span class="spaner"></span>
</div>

答案 1 :(得分：2)

与jQuery不同，jQuery具有相同的API可以处理单个元素以及jQuery元素集合，而DOM API则要求您在NodeList / {{3 }}对象。

除此之外，您不想使用所有loader类的元素并将所有image类的元素添加到列表中，而是要使用HTMLCollection。

document.addEventListener("DOMContentLoaded", function() {
  var counter = 0;

  // Start the changing images
  setInterval(function() {
    if(counter == 4) { 
      counter = 0; 
    }

    changeImage(counter);
    counter++;
  }, 3000);

  // Set the percentage off
  loading();
});

function changeImage(counter) {
  var images = [
    '<i class="fa fa-cubes"></i>',
    '<i class="fa fa-rocket"></i>',
    '<i class="fa fa-pie-chart"></i>',
    '<i class="fa fa-codepen"></i>'
  ];

  [...document.querySelectorAll(".loader .image")].forEach((loader) => {
    loader.innerHTML = images[counter];
  })
}

function loading(){
  var num = 0;

  for(i=0; i<=100; i++) {
    setTimeout(function() { 
      [...document.getElementsByClassName("spaner")].forEach((spaner) => {
      spaner.innerHTML = num + '%';
      })

      if(num == 100) {
        loading();
      }
      num++;
    },i*120);
  };

}
@import url(https://fonts.googleapis.com/css?family=Lato:100,300,400,700,900);

html,body {
  margin: 0;
  padding: 0;
  font-family:'Lato', sans-serif;
}
.loader {
  width: 100px;
  height: 80px;
  position: absolute;
  top: 0; right: 0; left: 0; bottom: 0;
  margin: auto;
}
.loader .image {
  width: 100px;
  height: 160px;
  font-size: 40px;
  text-align: center;
  transform-origin: bottom center;
  animation: 3s rotate infinite;
  opacity: 0;
}
.loader span {
  display: block;
  width: 100%;
  text-align: center;
  position: absolute;
  bottom: 0;
}

@keyframes rotate{
  0% {
    transform: rotate(90deg);
  }
  10% {
    opacity: 0;
  }
  35% {
    transform: rotate(0deg);
    opacity: 1;
  }
  65% {
    transform: rotate(0deg);
    opacity: 1;
  }
  80% {
    opacity: 0;
  }
  100% {
    transform: rotate(-90deg);
  }
}
<link href="https://use.fontawesome.com/releases/v5.7.1/css/all.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="loader">
  <div class="image">
    <i class="fa fa-codepen"></i>
  </div>
  <span class="spaner"></span>
</div>

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