whiled.github.io/index.html at master · whileD/whiled.github.io · GitHub

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<!DOCTYPE html>
<html>
    <head>
        <title>ろーりんぐさんかく</title>
        <meta charset="utf-8">
        <script src="https://code.jquery.com/jquery-3.2.1.slim.js"
            integrity="sha256-tA8y0XqiwnpwmOIl3SGAcFl2RvxHjA8qp0+1uCGmRmg="
            crossorigin="anonymous"></script>
        <style>
            #triangle {
                position: absolute;
                width: 0;
                height: 0;
                border-style: solid;
                border-width: 0 100px 173.2px 100px;
                border-color: transparent transparent #ffcc00 transparent;
            }

        </style>
    </head>

    <body>
        <h1>ローリング△さんかく</h1>
        <div id="triangle"></div>

        <script>
            //三角形の回転
            let triangle = $("#triangle")
            let r = 0;
            triangle.css("bottom", "50%")
            //三角形の場所
            let vecRight = true;
            let xp = 0;

            $(document).ready(function(){
                setInterval(function(){
                    if(r++ > 360){
                        r = 0
                    }else{
                        triangle.css("transform", "rotate(" + r + "deg)")
                    }
                    moveTriangle()
                },10)
            })

            function moveTriangle() {
                if(vecRight) xp++
                else xp--
                if(xp > $(window).width()) vecRight = false
                else if (xp < 0)vecRight = true
                triangle.css("left", xp + "px")
            }

        </script>
    </body>

</html>