复制到粘贴板
这是一个简单的小知识，本周我做了一个简单的“复制到剪贴板”按钮，这是我第一次做这种功能，向大家分享一下我的实现方法。
这很简单，比较麻烦的是我们必须为需要复制的文本增加<input/>标签。之后我们选择要复制的内容然后调用复制命令execCommand.
execCommand('copy') 将会复制被选择的内容。
此方法目前被所有最新版本的浏览器支持，它可以让我们执行如复制、剪切、粘贴等命令，还可以改变字体颜色、大小等。
document.querySelector('#input').select();
document.execCommand('copy');
具体表现看这里
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