console 命令行工具 X clear

console

function changeValue(){
    const div = document.getElementById('value')
    var rand = ''
    for(var i=0;i<8;i++){
        rand += Math.floor(Math.random()*10)
    }
    div.innerText = rand
}

<div id="value"></div>
<button onclick="changeValue()">改变</button>