今天我又碼了兩個特效:一個是用原生input[type=range]的,另一個完全自定義的;下面是完整代碼和演示:
<!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(){
//原生組件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+'%';
};
//自定義組件
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;
//減---
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>
按住按鈕0.5秒, 會持續變化!
</form>
</body>
</html>
第一個的實現很簡單,就不做解釋了,自己看代碼;
這裡主要介紹第二個實例的實現:
在我們看到一個需求,或者別人的特效時,不急著去看別人的代碼,先想想,要是你,該怎麼實現?先把思路整理出來
該特效的實現原理:
1. 一個span內嵌套一個span;
•外面的span:只顯示寬、高、邊框,背景無
•裡面的span:高度和外面一樣,寬度為默認的50%,先設置好背景顏色為線性漸變
2. 按鈕的onclick事件比較簡單,點一下,就改變裡面的span的寬度和顯示數字
3. 當按鈕的onmousedown時,啟動計時器,等500ms後執行函數change函數,而change函數是一個用setTimeout回調自身的函數,他會沒16.7ms回調一次,達到動畫效果
難點解析:
1. 這一句 var a = parseFloat(window.getComputedStyle(outer2,null).width)/100;
用來獲得初始值,如果你用outer2.style.width
是得不到值得,當然你也可以將a設個固定值,比如這裡可以設為
var a = 1.3,
注意IE9以下不支持getComputedStyle方法,
IE的Element對象有currentStyle屬性;
2. 這一句
btn1.onmouseup = function(){clearTimeout(id1);
clearTimeout(id)};
很關鍵,沒了它,在onclick觸發之前,會先觸發onmosedown,在500ms後,開始執行,之後一直執行外層的計時器;
3. 其它的都不是難點;
這個實例其實擴展到其它很多應用,比如可以把中間的顯示部分替換為文章、圖片等等,再把按鈕換成自定義的,效果將會很酷的!
如果您覺得我有寫的不好的地方,歡迎指出!
以上這篇JavaScript實戰(原生range和自定義特效)簡單實例就是小編分享給大家的全部內容了,希望能給大家一個參考,也希望大家多多支持。