Javascript----實現火箭按鈕網頁置頂

來源:互聯網
上載者:User

標籤:scrollto   char   position   osi   document   htm   技術   text   按鈕   

1、代碼

 

 <!DOCTYPE html><html><head>    <meta charset="UTF-8">    <title></title></head><body>    <!--火箭2.0版本(火箭的速度先快後慢,當body的scorllTop距離小於8%時,速度變快,並且火箭最終飛出頂部)-->    <style type="text/css">    * {        margin: 0;        padding: 0;    }    .web {        height: 10000px;        background: linear-gradient(#fff, #000);    }    .rocket {        width: 149px;        height: 249px;        background: url(imgs/rocket_button_up.png) 0% 0%;        position: fixed;        top: 420px;        right: 20px;        cursor: pointer;    }    .rocket:hover {        background-position: -100% 0;    }    </style>    <div class="web">    </div>    <div class="rocket" title="點擊回到頂部" id=‘rocket‘>    </div>    <script type="text/javascript">    var rocketBtn = document.getElementById("rocket");    var d1 = parseInt(getComputedStyle(rocketBtn, "position").getPropertyValue("top"));    var d = d1;    var s = 2;    var interVal;    var rocketSpeed = 10;    rocketBtn.addEventListener("click", function() {    var scrollPosition = window.document.body.scrollTop;    console.log(scrollPosition);             interVal = setInterval(function() {            if(d>-250){           // console.log(d+"/"+(d1+500)+"="+d/(d1+500));            if(d/(d1+250)<0.3){            rocketSpeed = 100;            }            }            if (d >-400) {                if (s != 6) {                    s++;                } else {                    s = 2;                }                rocketBtn.setAttribute("style", "top:" + d);                d -= rocketSpeed;                if(rocketSpeed>4){                    rocketSpeed-=0.2;                }                //console.log("d1:" + d1 + "-->d:" + d);                rocketBtn.style.backgroundPosition = (-100 * s) + "% 0";                window.document.body.scrollTop -= 1000;            } else {                clearInterval(interVal);            }        }, 50)    })    </script></body></html>

  

 

 

 

2、效果

 3、總結

 

Javascript----實現火箭按鈕網頁置頂

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