JavaScript实战(原生range和自定义特效)简单实例
今天我又码了两个特效:一个是用原生input[type=range]的,另一个完全自定义的;下面是完整代码和演示:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style> #tip{ position: absolute; top: 30px; left: 0; right: 0; width: 200px; height: 160px; margin: auto; border: 1px solid gray; background-color: cornsilk; } #tip div{ position: relative; width: 100%; height: 80px; border-bottom: 1px solid gray; } .out{ position: relative; left: 16%; display: inline-block; border: 2px solid royalblue; margin-top: 20px; width: 130px; height: 20px; background-color: lightgoldenrodyellow; } .in{ display: block; height: 20px; line-height: 20px; text-align: right; color: white; width: 50%; background-image: linear-gradient(to right,powderblue 0%,#336699 50%,red 100%); -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none; } input[type="range"] { position: relative; left: 19%; top: 5px; box-shadow: 0 1px 0 0px #424242, 0 1px 0 #060607 inset, 0px 2px 10px 0px black inset, 1px 0px 2px rgba(0, 0, 0, 0.4) inset, 0 0px 1px rgba(0, 0, 0, 0.6) inset; background-color: lightskyblue; border-radius: 15px; width: 60%; -webkit-appearance: none; -moz-appearance: none; appearance: none; height:15px; } input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; -moz-appearance: none; appearance: none; height: 20px; width: 10px; background-color: coral; border-radius: 15px; -webkit-box-shadow: 0 -1px 1px black inset; -moz-box-shadow: 0 -1px 1px black inset; box-shadow: 0 -1px 1px black inset; } input[type="range"]:before{ content: attr(value); color: white; border-radius: 5px 0 0 5px; background-color: lightskyblue; } input[type="range"]:after{ content: attr(max); color: white; border-radius:0 5px 5px 0; background-color: lightskyblue; } .b{ display: inline-block; width: 22px; padding: 0; } #outer2{left: 5px} #btn1{ position: relative; left: 5px; } #btn2{ position: relative; left: 5px; } </style> <script> window.onload = function(){ //原生组件range var inner = document.getElementById('inner1'); var range = document.getElementById('range'); range.onclick = function(){ inner.innerHTML = range.value; inner.style.width = range.value+'%'; }; range.onmousemove = function(){ inner.innerHTML = range.value; inner.style.width = range.value+'%'; }; //自定义组件 var outer2 = document.getElementById('outer2'); var inner2 = document.getElementById('inner2'); var btn1 = document.getElementById('btn1'); var btn2 = document.getElementById('btn2'); var id,id1; var value = parseInt(inner2.innerHTML); var a = parseFloat(window.getComputedStyle(outer2,null).width)/100; //减--- btn1.onmousedown = function(){ id1 = setTimeout(function change(){ if(value>0) { value--; inner2.innerHTML = value; inner2.style.width = (value) * a + 'px'; id = setTimeout(function(){ clearTimeout(id); change(); },16.7); }else{clearTimeout(id);} },500); }; btn1.onmouseup = function(){clearTimeout(id1);clearTimeout(id)}; btn1.onclick = function(){ console.log('a:'+a+','+'value:'+value); if(value>0){ value--; inner2.innerHTML = value; inner2.style.width = (value)*a+'px'; } }; //加+++ btn2.onmousedown = function(){ id1 = setTimeout(function change(){ if(value<100) { value++; inner2.innerHTML = value; inner2.style.width = value * a + 'px'; id = setTimeout(function(){ clearTimeout(id); change(); },16.7); }else{clearTimeout(id);} },500); }; btn2.onmouseup = function(){clearTimeout(id1);clearTimeout(id)}; btn2.onclick = function(){ if(value<100){ value++; inner2.innerHTML = value; inner2.style.width = value*a+'px'; } } } </script> </head> <body> <form id="tip"> <div> <span id="outer1" class="out"> <span id="inner1" class="in">50</span> </span> <input id="range" class="ran" type="range" min="0" max="100" step="1" value="50"> </div> <div id="d2"> <input id="btn1" class="b" type="button" value="<"> <span id="outer2" class="out"> <span id="inner2" class="in">50</span> </span> <input id="btn2" class="b" type="button" value=">"> </div> 按住按钮0.5秒, 会持续变化! </form> </body> </html>
第一个的实现很简单,就不做解释了,自己看代码;
这里主要介绍第二个实例的实现:
在我们看到一个需求,或者别人的特效时,不急着去看别人的代码,先想想,要是你,该怎么实现?先把思路整理出来
该特效的实现原理:
1. 一个span内嵌套一个span;
"color: #ff0000">2. 按钮的onclick事件比较简单,点一下,就改变里面的span的宽度和显示数字
3. 当按钮的onmousedown时,启动计时器,等500ms后执行函数change函数,而change函数是一个用setTimeout回调自身的函数,他会没16.7ms回调一次,达到动画效果
难点解析:
1. 这一句 var a = parseFloat(window.getComputedStyle(outer2,null).width)/100;
用来获得初始值,如果你用outer2.style.width
是得不到值得,当然你也可以将a设个固定值,比如这里可以设为
var a = 1.3,
注意IE9以下不支持getComputedStyle方法,
IE的Element对象有currentStyle属性;
2. 这一句
btn1.onmouseup = function(){clearTimeout(id1);
clearTimeout(id)};
很关键,没了它,在onclick触发之前,会先触发onmosedown,在500ms后,开始执行,之后一直执行外层的计时器;
3. 其它的都不是难点;
这个实例其实扩展到其它很多应用,比如可以把中间的显示部分替换为文章、图片等等,再把按钮换成自定义的,效果将会很酷的!
如果您觉得我有写的不好的地方,欢迎指出!
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