瀏覽器下載img標簽Base64圖片

https://blog.csdn.net/qq_42076140/article/details/82113622    原文地址

<a href="javascript:download();" >點擊下載圖片</a>

 //下載圖片
function  download() {
     var imgData =  $("#showPayPic").prop('src');//這裡放需要下載的base64
    downloadFile(new Date().getTime()+".png", imgData);
 }
 //下載
 function downloadFile(fileName, content) {
     var aLink = document.createElement('a');
     var blob = this.base64ToBlob(content); //new Blob([content]);
     var evt = document.createEvent("HTMLEvents");
     evt.initEvent("click", true, true);//initEvent 不加後兩個參數在FF下會報錯  事件類型，是否冒泡，是否阻止瀏覽器的預設行為
     aLink.download = fileName;
     aLink.href = URL.createObjectURL(blob);
     // aLink.dispatchEvent(evt);
     aLink.click()
 }
 //base64轉blob
 function base64ToBlob(code) {
     var parts = code.split(';base64,');
     var contentType = parts[0].split(':')[1];
     var raw = window.atob(parts[1]);
     var rawLength = raw.length;

     var uInt8Array = new Uint8Array(rawLength);

     for (var i = 0; i < rawLength; ++i) {
         uInt8Array[i] = raw.charCodeAt(i);
     }
     return new Blob([uInt8Array], {type: contentType});
 }