this.downloadFile(_source, "保存的图.png");
//_source为base64路径
private downloadFile(content: string, fileName: string): any {
var base64ToBlob = function (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
});
};
let aLink = document.createElement('a');
let blob = 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.click();
}