console 命令行工具 X clear

console

const count = 100000;

function append() {
    const start = Date.now();
    for (let i = 0; i < count; i++) {
        const el = document.createElement("div");
        el.style.background = "#ccc";
        el.innerText = `第${i}个`;
        document.body.appendChild(el);
    }
    console.log(Date.now() - start);
}

<button onclick="append()">change</button>