如何在javascript中通过命令使图像工作？

这似乎不起作用

<script>
function imageCommand() {
    var imgdraw = prompt("type in an image adress")
    var img = document.createElement("img");
    img.src = imgdraw;
}
</script>

<a href="javascript:imageCommand()">click here to draw something on the screen</a>

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您需要将创建的图像对象附加到某个位置。例如，身体：

function imageCommand() {
    var imgdraw = prompt("type in an image adress")
    var img = document.createElement("img");
    img.src = imgdraw;
    document.body.appendChild(img);
}