原生js实现点击复制功能

<input type="text">
<button>复制</button>
<script>
var input = document.getElementsByTagName(‘input‘)[0]
var button = document.getElementsByTagName(‘button‘)[0]
button.onclick = function(){
    input.value = "hello world"
    input.select()
    document.execCommand("copy")
}
</script>

cut
delete
copy