dom-to-image生成图片并下载
姬正文
- 下载必要的js库npm install dom-to-image
- 引用库import domtoimage from ‘dom-to-image’;
①生成png的图片插入的到当前页面
var node = document.getElementById('my-node');
domtoimage.toPng(node)
.then(function (dataUrl) {
var img = new Image();
img.src = dataUrl;
document.body.appendChild(img);
})
.catch(function (error) {
console.error('oops, something went wrong!', error);
});
②生成图片并下载png格式
domtoimage.toBlob(document.getElementById('my-node'))
.then(function (blob) {
window.saveAs(blob, 'my-node.png');
});
③生成图片并下载jpeg格式
domtoimage.toJpeg(document.getElementById('my-node'), { quality: 0.95 })
.then(function (dataUrl) {
var link = document.createElement('a');
link.download = 'my-image-name.jpeg';
link.href = dataUrl;
link.click();
});
④还两种生成SVG和pixel data的
domtoimage.toSvg(document.getElementById('my-node'), {filter: filter})
.then(function (dataUrl) {
/* do something */
});
var node = document.getElementById('my-node');
domtoimage.toPixelData(node)
.then(function (pixels) {
for (var y = 0; y < node.scrollHeight; ++y) {
for (var x = 0; x < node.scrollWidth; ++x) {
pixelAtXYOffset = (4 * y * node.scrollHeight) + (4 * x);
/* pixelAtXY is a Uint8Array[4] containing RGBA values of the pixel at (x, y) in the range 0..255 */
pixelAtXY = pixels.slice(pixelAtXYOffset, pixelAtXYOffset + 4);
}
}
});
完整的Demo：
<html>
<head>
<script type="text/javascript" src="jquery-1.11.2.min.js"></script>
<script type="text/javascript" src="dom-to-image.js"></script>
<script type="text/javascript" src="FileSaver.js"></script>
<script type="text/javascript">
$(function(){
//
$("#btn").click(function(){
// 插入图片到html
// var node = document.getElementById('table');
// domtoimage.toPng(node)
// .then(function (dataUrl) {
// var img = new Image();
// img.src = dataUrl;
// document.body.appendChild(img);
// });
// 下载png图片
domtoimage.toBlob(document.getElementById('table'))
.then(function (blob) {
window.saveAs(blob, 'my-node.png');
});
// 下载jpeg图片
// domtoimage.toJpeg(document.getElementById('my-node'), { quality: 0.95 })
// .then(function (dataUrl) {
// var link = document.createElement('a');
// link.download = 'my-image-name.jpeg';
// link.href = dataUrl;
// link.click();
// });
// var node = document.getElementById('table');
// domtoimage.toPixelData(node)
// .then(function (pixels) {
// for (var y = 0; y < node.scrollHeight; ++y) {
// for (var x = 0; x < node.scrollWidth; ++x) {
// pixelAtXYOffset = (4 * y * node.scrollHeight) + (4 * x);
// /* pixelAtXY is a Uint8Array[4] containing RGBA values of the pixel at (x, y) in the range 0..255 */
// pixelAtXY = pixels.slice(pixelAtXYOffset, pixelAtXYOffset + 4);
// }
// }
// });
})
</script>
</head>
<body>
<input type="button" id="btn" value="do it" />
<h4>两行三列：</h4>
<table id="table" border="1" style="width:200px;border-collapse: collapse;border:1px solid black;">
<tr style="background:green;">
<td rowspan="3">200</td>
<td>200</td>
<td>300</td>
</tr>
<tr style="background:green;">
<td rowspan="2">500</td>
<td>600</td>
</tr>
<tr style="background:green;">
<td>600</td>
</tr>
<tr style="background:skyblue;">
<td rowspan="3">100</td>
<td>200</td>
<td>300</td>
</tr>
<tr style="background:skyblue;">
<td>500</td>
<td>600</td>
</tr>
<tr style="background:skyblue;">
<td>600</td>
<td>600</td>
</tr>
</table>
</body>
</html>
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