html2canvas生成並下載圖片

html

<div  id="downChart">
</div>

jq

new html2canvas(document.getElementById('downChart'),{
        backgroundColor: "transparent",        //背景圖片透明
        allowTaint: true,    //跨域
        useCORS: true         //跨域
    }).then(canvas => {
        // canvas為轉換后的Canvas對象
        let oImg = new Image();
        oImg = canvas.toDataURL('image/png');  // 導出圖片
        console.log(oImg)

        var oA = document.createElement("a");
        oA.download = '';// 設置下載的文件名，默認是'下載'
        oA.href = oImg;
        document.body.appendChild(oA);
        oA.click();
        oA.remove(); // 下載之后把創建的元素刪除
      });