jquery动画效果实例_动画js

文章目录

• JS动画实现
• • 概述
  • 匀速动画
  • 缓速动画
  • 无缝连续滚动特效
  • 轮播图
  • 轮播图淡入淡出效果

JS动画实现

概述

• 在CSS3中可以通过transition过渡属性可以实现动画
• JS可以利用CSS3中的transition属性实现元素动画

匀速动画

JS封装匀速动画

<button id="btn">开始动画</button>
<div id="box"></div>

var btn = document.querySelector("#btn");
var box = document.querySelector("#box");
var timer = null;
var left = 0;
function animation(target, distance, time) { 

var each = parseInt(distance / time * 30);
clearInterval(timer);
timer = setInterval(function() { 

if (left >= distance) { 

clearInterval(timer);
} else { 

left += each;
target.style.left = left + "px";
}
}, 30);
};
btn.onclick = function() { 

animation(box, 800, 2000);
};

利用CSS transition属性实现平滑动画效果

<button>开始动画</button>
<div id="box"></div>
<script> var btn = document.querySelector("button"); var box = document.querySelector("#box"); btn.onclick = function() { 
 box.style.transition = "all 2s linear 0s"; box.style.left = "800px"; }; </script>

缓速动画

var btn = document.querySelector("#btn");
var box = document.querySelector("#box");
var timer = null;
var left = 0;
function animation(target, distance) { 

clearInterval(timer);
timer = setInterval(function() { 

if (left >= distance) { 

clearInterval(timer);
} else { 

var step = (distance - left) / 10;
step = step > 0 ? Math.ceil(step) : Math.floor(step);
left += step;
target.style.left = left + "px";
}
}, 30);
};
btn.onclick = function() { 

animation(box, 800);
};

无缝连续滚动特效

<div id="banner" class="banner">
<ul id="list">
<li><img src="images/0.png" alt=""></li>
<li><img src="images/1.png" alt=""></li>
<li><img src="images/2.png" alt=""></li>
<li><img src="images/3.png" alt=""></li>
<li><img src="images/4.png" alt=""></li>
<li><img src="images/5.png" alt=""></li>
</ul>
</div>

* { 

margin: 0;
padding: 0;
}
.banner { 

width: 1000px;
height: 130px;
border: 1px solid red;
margin: 50px auto;
overflow: hidden;
}
.banner ul { 

list-style: none;
width: 5000px;
position: relative;
}
.banner ul li { 

float: left;
margin-right: 10px;
}

var banner = document.querySelector("#banner");
var list = document.querySelector("#list");
list.innerHTML += list.innerHTML;
var left = 0;
var timer = null;
startMove();
function startMove() { 

clearInterval(timer);
timer = setInterval(function() { 

left -= 4;
if (left <= -1260) { 

left = 0;
}
list.style.left = left + "px";
}, 20);
}
function stopMove() { 

clearInterval(timer);
}
banner.onmouseenter = function() { 

stopMove();
};
banner.onmouseleave = function() { 

startMove();
};

轮播图

<div id="banner" class="banner">
<ul id="list">
<li><img src="images/0.png" alt=""></li>
<li><img src="images/1.png" alt=""></li>
<li><img src="images/2.png" alt=""></li>
<li><img src="images/3.png" alt=""></li>
<li><img src="images/4.png" alt=""></li>
<li><img src="images/5.png" alt=""></li>
</ul>
<a id="leftBtn" class="left-btn" href="javascript:;">&lt;</a>
<a id="rightBtn" class="right-btn" href="javascript:;">&gt;</a>
</div>

* { 

margin: 0;
padding: 0;
}
.banner { 

width: 650px;
height: 360px;
border: 1px solid red;
margin: 50px auto;
overflow: hidden;
position: relative;
}
.banner ul { 

list-style: none;
width: 5000px;
height: 100%;
position: relative;
left: 0;
}
.banner ul li { 

float: left;
}
.banner ul li img { 

width: 650px;
height: 360px;
}
.banner a { 

text-decoration: none;
color: white;
text-align: center;
line-height: 50px;
}
.banner .left-btn { 

position: absolute;
width: 50px;
height: 50px;
left: 20px;
top: 50%;
margin-top: -25px;
background-color: rgba(0, 0, 0, .5);
border-radius: 50%;
}
.banner .right-btn { 

position: absolute;
width: 50px;
height: 50px;
right: 20px;
top: 50%;
margin-top: -25px;
background-color: rgba(0, 0, 0, .5);
border-radius: 50%;
}

var banner = document.querySelector("#banner");
var dot = document.querySelector("#banner #dot");
var list = document.querySelector("#list");
var leftBtn = document.querySelector("#leftBtn");
var rightBtn = document.querySelector("#rightBtn");
var firstLi = list.lastElementChild.cloneNode(true);
var lastLi = list.firstElementChild.cloneNode(true);
list.insertBefore(firstLi, list.firstElementChild);
list.appendChild(lastLi);
//总长度
var length = list.childElementCount;
//当前显示第几页
var index = 1;
//节流锁
var lock = false;
function setPage(index) { 

list.style.transition = "left .5s ease 0s";
list.style.left = -index * 650 + "px";
}
setPage(index);
rightBtn.onclick = function() { 

if (lock) { 

return;
}
lock = true;
index++;
setPage(index);
if (index === length - 1) { 

setTimeout(function() { 

index = 1;
list.style.transition = "none";
list.style.left = -index * 650 + "px";
}, 500);
}
setTimeout(function() { 

lock = false;
}, 500);
};
leftBtn.onclick = function() { 

if (lock) { 

return;
}
lock = true;
index--;
setPage(index);
if (index === 0) { 

setTimeout(function() { 

index = length - 2;
list.style.transition = "none";
list.style.left = -index * 650 + "px";
}, 500);
}
setTimeout(function() { 

lock = false;
}, 500);
};

轮播图淡入淡出效果

<div id="banner" class="banner">
<ul id="list">
<li><img src="images/0.png" alt=""></li>
<li><img src="images/1.png" alt=""></li>
<li><img src="images/2.png" alt=""></li>
<li><img src="images/3.png" alt=""></li>
<li><img src="images/4.png" alt=""></li>
<li><img src="images/5.png" alt=""></li>
</ul>
<a id="leftBtn" class="left-btn" href="javascript:;">&lt;</a>
<a id="rightBtn" class="right-btn" href="javascript:;">&gt;</a>
</div>

* { 

margin: 0;
padding: 0;
}
.banner { 

width: 650px;
height: 360px;
border: 1px solid red;
margin: 50px auto;
overflow: hidden;
position: relative;
}
.banner ul { 

list-style: none;
width: 5000px;
height: 100%;
position: relative;
left: 0;
}
.banner ul li { 

position: absolute;
top: 0;
left: 0;
opacity: 0;
transition: opacity 1s ease 0s;
}
.banner ul li:first-child { 

opacity: 1;
}
.banner ul li img { 

width: 650px;
height: 360px;
}
.banner a { 

text-decoration: none;
color: white;
text-align: center;
line-height: 50px;
}
.banner .left-btn { 

position: absolute;
width: 50px;
height: 50px;
left: 20px;
top: 50%;
margin-top: -25px;
background-color: rgba(0, 0, 0, .5);
border-radius: 50%;
}
.banner .right-btn { 

position: absolute;
width: 50px;
height: 50px;
right: 20px;
top: 50%;
margin-top: -25px;
background-color: rgba(0, 0, 0, .5);
border-radius: 50%;
}

var banner = document.querySelector("#banner");
var lis = document.querySelectorAll("#list li");
var leftBtn = document.querySelector("#leftBtn");
var rightBtn = document.querySelector("#rightBtn");
var index = 0;
var length = lis.length;
var lock = false;
rightBtn.onclick = function() { 

if (lock) { 

return;
}
lock = true;
lis[index].style.opacity = 0;
index++;
if (index >= length) { 

index = 0;
}
lis[index].style.opacity = 1;
setTimeout(function() { 

lock = false;
}, 1000);
};
leftBtn.onclick = function() { 

if (lock) { 

return;
}
lock = true;
lis[index].style.opacity = 0;
index--;
if (index < 0) { 

index = length - 1;
}
lis[index].style.opacity = 1;
setTimeout(function() { 

lock = false;
}, 1000);
};

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原文地址：https://cloud.tencent.com/developer/article/2150755