使用JavaScript下载图像
我正在编写JavaScript代码来上传、预览和下载图像。目前我已经做了上传和预览代码。之后,如何下载呢使用JavaScript下载图像,javascript,html,image,web,canvas,Javascript,Html,Image,Web,Canvas,我正在编写JavaScript代码来上传、预览和下载图像。目前我已经做了上传和预览代码。之后,如何下载呢 <section class="upload" id="upload"> <h3>UPLOAD</h3> <div class="container"> <div class=&qu
<section class="upload" id="upload">
<h3>UPLOAD</h3>
<div class="container">
<div class="row">
<canvas id="c" class="p-3" >Here's the canvas.</canvas>
<br>
<input type="file" id="infile" accept = "image/*" onchange="handleFiles(this.files)">
<p><img id="output" /></p>
<button onclick="blurimg()" class="btnbl">Blur Image</button>
<br>
</div>
</div>
</section>
未经测试,但符合以下要求:
异步函数下载画布(){
常量类型='image/jpeg'
常数质量=1
constblob=wait new Promise(rs=>canvas.toBlob(rs,type,quality)
const link=document.createElement('a')
a、 href=URL.createObjectURL(blob)
a、 下载='cat.jpg'
a、 单击()
}
如果您想要并支持更新的浏览器,则可以使用而不是绘制
您可以在HTML
中执行此操作检查此示例:
//Canvas creating with image
document.getElementById('infile').onchange = function(e) {
var img = new Image();
img.onload = draw;
img.onerror = failed;
img.src = URL.createObjectURL(this.files[0]);
};
function draw() {
var canvas = document.getElementById('c');
canvas.width = this.width;
canvas.height = this.height;
var ctx = canvas.getContext('2d');
ctx.drawImage(this, 0,0);
}
function failed() {
console.error("The provided file couldn't be loaded as an Image media");
}