ページをリロードせずにJavaScriptで履歴レコードを作成する方法(コード)

nbsp;html>


    <meta>
    <title>Title</title>
    <style>
        body{
            background: #ccc;
        }
        .colorBlock {
            border: 10px solid #fff;
            height: 40vh;
            width: 40vh;
            margin: 20vh auto 10vh;
            color: #ffffff;
            font-size: 40px;
            line-height: 40vh;
            text-align: center;
        }
        .colorBlue{
            border: 10px solid #fff;
            height: 40vh;
            width: 40vh;
            margin: 20vh auto 10vh;
            color: #ffffff;
            font-size: 40px;
            line-height: 40vh;
            text-align: center;
            background: cornflowerblue;
        }
        .colorgray{
            border: 10px solid #fff;
            height: 40vh;
            width: 40vh;
            margin: 20vh auto 10vh;
            color: #ffffff;
            font-size: 40px;
            line-height: 40vh;
            text-align: center;
            background: lightcoral;
        }
        .colorgreen{
            border: 10px solid #fff;
            height: 40vh;
            width: 40vh;
            margin: 20vh auto 10vh;
            color: #ffffff;
            font-size: 40px;
            line-height: 40vh;
            text-align: center;
            background: greenyellow;
        }
        .btnBlock{
            text-align: center;
        }
        .btn{
            border: 5px solid #ffffff;
            font-size: 24px;
            line-height: 50px;
            width: 40vh;
        }
    </style>


<div>
    加载中....
</div>
<div>
    <button>change-url</button>
</div>
<script>
    (
        function () {
            var a=0;
            setInterval(function () {
                a++;
                document.getElementById("content").innerText=a;
            },1000)
        }
    )()
    window.addEventListener("hashchange",function (e) {
        var now=location.hash && location.hash.substring(1);
        switch (now){
            case "blue":
                document.getElementById("content").setAttribute("class","colorBlue");
                break;
            case "gray":
                document.getElementById("content").setAttribute("class","colorgray");
                break;
            case "green":
                document.getElementById("content").setAttribute("class","colorgreen");
                break;
        }

    },false);
    document.getElementsByClassName("btn")[0].addEventListener("click",function () {
        var now=location.hash && location.hash.substring(1);
        if(now=="blue"){
            location.hash="gray"
            document.getElementById("content").setAttribute("class","colorgray");
        }else if(now=="gray"){
            location.hash="green"
            document.getElementById("content").setAttribute("class","colorgreen");
        }else if(now=="green"){
            location.hash="blue"
            document.getElementById("content").setAttribute("class","colorBlue");
        }
    },false);
</script>