console 命令行工具 X clear

console

let btn = document.querySelector('button');

btn.ondragstart = function(){
    console.log('开始')
    this.style.visibility = 'hidden'
}
btn.ondragend = function(){
    this.style.visibility = ''
}

<html>
    <body>
	<button  draggable="true">按钮</button>
    <div id='wrap'>
        afsd
    </div>
</body>
</html>

html{
    background-color: white;
}
#wrap{
    height: 300px;
    width:300px;
    border:1px dashed black;
    
}