6行代码实现输入qq号获取qq头像

经常需要用到QQ头像，做个小笔记

<input type="number" id="qq" />
<button id="button1">获取头像</button>
<img id="img1" src="" />

button1.onclick = function () {
  img1.src = "http://q1.qlogo.cn/g?b=qq&nk=" + qq.value + "&s=640"; //&s是尺寸  有40 100 140 640
};