HTML转Canvas转图片下载

如题HTML元素转Canvas再转图片然后下载

需要用到插件：html2canvas 可自行到官网下载最新版本

 

效果图：

 

 示例代码：

<!doctype html>
<html>

<head>
  <meta charset="UTF-8">
  <meta name="viewport"
    content="width=device-width,user-scalable=no,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0">
  <title>HTMLToCanvasToPictureToFile</title>
</head>
<style>
  * {
    margin: 0;
    padding: 0;
  }

  #d1 {
    width: 600px;
    font-style: italic;
    font-weight: bold;
    background: red;
  }

  #d1 div {
    padding: 20px;
    border: 5px solid black;
  }

</style>

<body>
  <h2>原始HTML</h2>
  <div id="d1">
    <div style="background:green;">
      <div style="background:blue;">
        <div style="background:yellow;">
          <div style="background:orange;">
            <span class="text">666666666666</span>
          </div>
        </div>
      </div>
    </div>
  </div>

  <!-- === HTML转画布 ======================== -->
  <button onclick="htmlToCanvas()">1. HTML转画布</button>
  <div id="renderCanvas"></div>

  <!-- === 画布转图片 ======================== -->
  <button onclick="canvasToImg()">2. 画布转图片</button>
  <br>
  <img id="myImg" src="">

  <!-- === 保存 ======================== -->
  <br>
  <button onclick="downloadImg()">3. 保存</button>

  <script type="text/javascript" src="./lib/html2canvas.min.js"></script>
  <script type="text/javascript">
    // HTML转画布
    function htmlToCanvas() {
      var DOM = document.getElementById("d1");
      html2canvas(DOM).then(function (canvas) {
        canvas.id = 'myCanvas'
        document.getElementById("renderCanvas").appendChild(canvas)
      });
    }

    // 画布转图片
    function canvasToImg() {
      var canvas = document.getElementById('myCanvas');
      const src = canvas.toDataURL("image/png");
      var img = document.getElementById('myImg');
      img.src = src
    }

    // 下载图片
    function downloadImg() {
      var img = document.getElementById('myImg');   // 获取要下载的图片
      var url = img.src;                            // 获取图片地址
      var a = document.createElement('a');          // 创建一个a节点插入的document
      var event = new MouseEvent('click')           // 模拟鼠标click点击事件
      a.download = 'beautifulGirl'                  // 设置a节点的download属性值
      a.href = url;                                 // 将图片的src赋值给a节点的href
      a.dispatchEvent(event)                        // 触发鼠标点击事件
    }

  </script>
</body>

</html>

 

 

 

 

 

 直接下载HTML

<!doctype html>
<html>

<head>
  <meta charset="UTF-8">
  <meta name="viewport"
    content="width=device-width,user-scalable=no,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0">
  <title>downloadHtml</title>
</head>
<style>
  * {
    margin: 0;
    padding: 0;
  }

  #d1 {
    width: 600px;
    font-style: italic;
    font-weight: bold;
    color: red;
    background: red;
  }

  #d1 div {
    padding: 20px;
    border: 5px solid black;
  }
</style>

<body>
  <h2>原始HTML</h2>
  <div id="d1">
    <div style="background:green;">
      <div style="background:blue;">
        <div style="background:yellow;">
          <div style="background:orange;">
            <span class="text">666666666666</span>
          </div>
        </div>
      </div>
    </div>
  </div>

  <button onclick="downloadHtml()">直接下载HTML</button>
  <script type="text/javascript" src="./lib/html2canvas.min.js"></script>
  <script type="text/javascript">
    function downloadHtml() {
      var DOM = document.getElementById("d1");
      html2canvas(DOM).then(function (canvas) {
        const src = canvas.toDataURL('image/png');
        const a = document.createElement('a')
        a.href = src;
        a.download = '下载HTML' // 文件名
        a.click();
        a.remove(); // 下载之后把创建的元素删除
      });
    }
  </script>
</body>

</html>

 

posted @ 2022-11-21 16:27  前端-大雄  阅读(274)  评论(0)  编辑  收藏  举报