碎碎念

轉自 https://blog.csdn.net/qq_35844177/article/details/79094249

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直接看代码

//下载图片
download() {
let imgData = 'data:image/png;base64,iVBORw0KGgoAAAANSUh........';
this.downloadFile('测试.png', 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(evt);
aLink.click()
},
//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});
},
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