save image function

index.html

<!-- codes -->

<div id="target">
<h1>Test print this</h1>
<div class='timetable'></div>
</div>

<button onclick="saveToImage()" class="saveImg">Save as Image</button>
<br><br>

<!-- codes -->

script.js

window.saveToImage = function() {
    html2canvas(document.getElementById("target"), {
        onrendered: function (canvas) {
            var img = canvas.toDataURL();
			window.open(img);
        }
    });
}