console 命令行工具 X clear

console

function test(){
    let d = document.getElementsByClassName('test')[0];
    let s = document.createElement('span')
    s.innerText = '222'
    d.appendChild(s)
}

<html>
    <div class="test" onclick="test()">
        111
    </div>
</html>

.test{
    color: red;
}