console 命令行工具 X clear

console

var a = document.createElement('input')
a.value = 222
a.setAttribute('type', 'text')
a.setAttribute('autofocus', 'autofocus')
document.body.appendChild(a)
setTimeout(function () {
  document.body.removeChild(a);
  setTimeout(function () {
    document.body.appendChild(a)
	},5000)
},3000)


function clickHandler() {
  var b = document.createElement('input')
  b.setAttribute('type', 'text')
	b.setAttribute('autofocus', 'autofocus')
  document.body.appendChild(b)
}

<button onclick="clickHandler()">t</button>