render_big_data.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <ul>控件</ul>
    <script>
        setTimeout(()=> {
            //插入十万条数据
            const total = 100000;
            //一次插入20条，如果觉得性能不好就减少
            const once = 20;
            const loopCount = total/once;
            let countOfRender = 0;
            let ul = document.querySelector('ul');
            function add () {
                //优化性能，插入不能造成重排
                const fragment = document.createDocumentFragment();
                for(let i=0;i<once;i++) {
                    const li = document.createElement('li');
                    li.innerText = Math.floor(Math.random()*total);
                    fragment.appendChild(li);
                }
                ul.appendChild(fragment);
                countOfRender += 1;
                loop();
            }

            function loop(){
                if(countOfRender < loopCount) {
                    window.requestAnimationFrame(add);
                }
            }
            loop();
        },0)
    </script>
</body>
</html>