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Javascript----实现火箭按钮网页置顶
1、代码
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <!-- 火箭2.0版本(火箭的速度先快后慢,当body的scorllTop距离小于8%时,速度变快,并且火箭最终飞出顶部) --> <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="点击回到顶部" 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、总结
Javascript----实现火箭按钮网页置顶
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