太懒了,直接贴vue中的代码,自己感悟
downLoadQRcode() {
if(!!this.imgUrl) {
let imgData = this.imgUrl;
this.downloadFile('QRcode.jpg', imgData);
}
},
// 下载
downloadFile(fileName, content) {
let aLink = document.createElement('a');
let blob = this.base64ToBlob(content); // new Blob([content]);
let evt = document.createEvent('HTMLEvents');
evt.initEvent('click', true, true);// initEvent 不加后两个参数在FF下会报错 事件类型，是否冒泡，是否阻止浏览器的默认行为
aLink.download = fileName;
aLink.href = URL.createObjectURL(blob);
aLink.dispatchEvent(new MouseEvent('click', {bubbles: true, cancelable: true, view: window}));// 兼容火狐
},
// base64转blob
base64ToBlob(code) {
let parts = code.split(';base64,');
let contentType = parts[0].split(':')[1];
let raw = window.atob(parts[1]);
let rawLength = raw.length;
let uInt8Array = new Uint8Array(rawLength);
for(let i = 0; i < rawLength; ++i) {
uInt8Array[i] = raw.charCodeAt(i);
}
return new Blob([uInt8Array], {type: contentType});
},
