console 命令行工具 X clear

console

document.querySelector('.aa').addEventListener('click',()=>{
    console.log(document.documentElement)
    
    document.documentElement.style.setProperty("--theme-color", `blue`);
})

<div class="aa" > assasssa</div>
<div class="ss">ssssaaaaaaaaaaaaaaaaaa</div>

:root{
    --theme-color:red;
    --theme-color2:blue;
}

.aa {
    background: var(--theme-color);
    margin-bottom: 20px;
}


.ss {
    background: var(--theme-color);
}