每天10个前端知识点:运动框架应用篇(下)
2017-02-13 本文已影响181人
WangChloe
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本次内容:打字依次显示效果、收起当前页放出下一页效果、分块运动、无缝幻灯片、带进度条的无缝幻灯片
10. 打字依次显示效果
<style>
body {
background: #000;
}
span {
color: #fff;
font-size: 20px;
opacity: 0;
}
</style>
<script type="text/javascript" src='move.js'></script>
<script>
window.onload = function () {
var str = '往左走(left负数)W = oUl.offsetWidth / 2;left -= 5;left = left % W;往右走(left正数)W = oUl.offsetWidht / 2;left += 5;left = (left % W - W) % W;';
for(var i = 0; i < str.length; i++) {
var oS = document.createElement('span');
oS.innerHTML = str.charAt(i);
document.body.appendChild(oS);
}
var aSpan = document.body.children;
var i = 0;
// 分步运动
var timer = setInterval(function() {
move(aSpan[i], {opacity: 1}, {duration: 100});
i++;
if(i == aSpan.length) {
clearInterval(timer);
}
}, 100);
}
</script>
效果示例
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11. 收起当前页放出下一页效果
<style>
* {
margin: 0;
padding: 0;
}
ul {
width: 516px;
margin: 50px auto;
}
ul li {
list-style: none;
width: 150px;
height: 150px;
background: #ccc;
float: left;
margin: 10px;
border: 1px solid #000;
}
</style>
<input type="button" value="下一页" id="btn1" />
<ul id="ul1">
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
<script type="text/javascript" src='move.js'></script>
<script>
window.onload = function() {
var oBtn = document.getElementById('btn1');
var oUl = document.getElementById('ul1');
var aLi = oUl.children;
// 浮动定位 -> 绝对定位
var aPos = [];
for (var i = 0; i < aLi.length; i++) {
aPos[i] = {
left: aLi[i].offsetLeft,
top: aLi[i].offsetTop
};
}
for (var i = 0; i < aLi.length; i++) {
aLi[i].style.position = 'absolute';
aLi[i].style.left = aPos[i].left + 'px';
aLi[i].style.top = aPos[i].top + 'px';
aLi[i].style.margin = 0;
}
var timer = null;
var bSin = false;
oBtn.onclick = function() {
if (bSin) return;
bSin = true;
// 分步运动
var i = 0;
timer = setInterval(function(){
(function(index){
// 收起
move(aLi[i], {
left: 0, top:0, width: 0,
height: 0, opacity: 0
},{
complete: function() { // 回调函数
if (index == aLi.length-1) {
// 放出
for (var i = 0; i < aLi.length; i++) {
aLi[i].style.background = 'rgb('+parseInt(Math.random()*256)+','+parseInt(Math.random()*256)+','+parseInt(Math.random()*256)+')';
}
timer = setInterval(function(){
(function(index2){
move(aLi[index], {
left: aPos[index].left, top: aPos[index].top, width: 150, height: 150, opacity: 1
},{
complete: function(){
if (index2 == 0) {
// 放出最后一张后点击才有效
bSin = false;
}
}
});
})(index);
index--;
if (index < 0) {
clearInterval(timer);
}
},200);
}
}
})
})(i);
i++;
if (i == aLi.length) {
clearInterval(timer);
}
},200);
};
};
</script>
效果示例

12. 分块运动
- 自定义行数R、列数C
- 创建span
计算oSpan的width、height、left、top、background-position
注意:先appendChild才能获取oSpan的offsetWidth和offsetHeight
- 分步运动,依次显示span
优化:setInterval可用for循环+setTimeout替代,可设置行列相关时同一时间出现
<style>
* {
margin: 0;
padding: 0;
}
#btn{
margin: 20px auto;
padding: 5px;
width: 100px;
height: 20px;
background: #f5850e;
color: #fff;
font-size: 16px;
text-align: center;
line-height: 20px;
border-radius: 5px;
cursor: pointer;
}
#box {
position: relative;
margin: 50px auto;
width: 500px;
height: 300px;
background: url('img/slide0.jpg');
}
#box span{
position: absolute;
opacity: .1;
/* opacity: 0; */
}
</style>
<div id='btn'>点击随机变换</div>
<div id="box"></div>
<script type="text/javascript" src='move.js'></script>
<script>
window.onload = function() {
var oBtn = document.body.children[0];
var oBox = document.body.children[1];
var R = 3;
var C = 5;
// 整图 -> 分块(绝对定位)
for(var r = 0; r < R; r++) {
for(var c = 0; c < C; c++) {
var oSpan = document.createElement('span');
oSpan.style.width = oBox.offsetWidth / C + 'px';
oSpan.style.height = oBox.offsetHeight / R + 'px';
oBox.appendChild(oSpan);
oSpan.style.left = oSpan.offsetWidth * c + 'px';
oSpan.style.top = oSpan.offsetHeight * r + 'px';
oSpan.style.backgroundPosition = - oSpan.offsetWidth * c + 'px ' + (-oSpan.offsetHeight * r) + 'px';
oSpan.r = r;
oSpan.c = c;
}
}
var aSpan = oBox.children;
var iNow = 0;
var bSin = false;
oBtn.onclick = function() {
if(bSin) {return;}
bSin = true;
iNow++;
oBox.style.background = 'url("img/slide'+ (iNow%9-1+9)%9 +'.jpg")';
block(parseInt(Math.random()*7+1)); // 随机变换显示方式
}
var json = {};
for(var i = 0; i < 8; i++) {
json[i] = 0;
}
function block(method) {
json[method]++;
var med = 1;
for(var i = 0; i < aSpan.length; i++) {
(function(index) {
switch(method) {
case 1: med = index;
break;
case 2: med = aSpan[index].r + aSpan[index].c; // 斜角显示
break;
case 3: med = aSpan[index].r * aSpan[index].c;
break;
case 4: med = aSpan[index].r - aSpan[index].c;
break;
case 5: med = aSpan[index].r / aSpan[index].c;
break;
case 6: med = aSpan.length - index; // 由下至上
break;
case 7: med = Math.random();
break;
}
setTimeout(function(){
aSpan[index].style.backgroundImage = 'url("img/slide'+ iNow%9 + '.jpg")';
aSpan[index].style.opacity = 0.1;
(function(index2) {
move(aSpan[index], {opacity: 1}, {complete: function() {
if(index2 == aSpan.length - 1) {
// 放出最后一个分块后点击才有效
bSin = false;
}
}});
})(index);
}, 100*(med)); // 每个分块延迟时间不同,达到依次显示的效果
})(i);
}
}
}
</script>
效果示例
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