最近在学习html5以及css3,在这里记录一下学到的一些新的属性，部分内容来自：http://www.w3school.com.cn
box-sizing盒子尺寸
box-sizing规定了盒子的计算方式，常用于消除hover时，盒子之间的影响，有三个属性：
box-sizing: content-box|border-box|inherit
content-box：默认值，表示盒子的尺寸为加上边框以及内边距之后的大小
border-box：规定了盒子的大小就是盒子的width以及height
inherit：表示盒子继承父元素box-sizing的值，示例代码：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> .box{ width: 200px; height: 200px; border: 20px solid red; padding: 20px; background-color: yellow; /*此时盒子尺寸为宽度加高度加内边距加边框，为280x280*/ /*box-sizing: content-box;*/ /*此时盒子尺寸为width以及height的值，为200x200*/ box-sizing: border-box; } </style></head><body> <div class="box"></div></body></html>
background-image多背景
background-image可以设置多背景，常用于把一张图切成几张图，当成背景，用于网站图片加载可以减轻网站的访问压力，用法如下：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>多背景</title> <style> .box{ width: 623px; height: 417px; background-repeat: no-repeat; /*多张图片用逗号隔开*/ background-image: url(images/bg1.png), url(images/bg2.png), url(images/bg3.png), url(images/bg4.png), url(images/bg5.png); background-position: left top, right top, right bottom, left bottom, center center; } </style></head><body> <div class="box"></div></body></html>
background-size背景尺寸
background-size可以实现修改背景的尺寸
background-size: length|percentage|cover|contain;
length：表示可以用长度宽度设置背景的尺寸
percentage：表示可以用百分比设置背景的尺寸
以上两种一般是设置两个值，如果只设置一个值，则另一个值为自动
cover：保证图片填充满元素，不管图片是否完整
contain：保证图片完整显示，不保证是否填充满元素,示例代码：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> .box { width: 500px; height: 500px; box-shadow: 0 0 1px #000; background-image: url("./images/1.jpg"); background-repeat: no-repeat; background-size: contain; } </style></head><body> <div class="box"></div></body></html>
background-origin背景原点
background-origin规定了background-position定位的位置
background-origin: padding-box|border-box|content-box;
border-box:从边框开始定位
padding-box:从内边距开始定位
content-box:从盒子内容开始定位，示例代码：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> .box { width: 400px; height: 400px; border: 20px solid rgba(255,0,0,0.5); padding: 20px; background-repeat: no-repeat; background-image: url("./images/54.jpg"); background-origin: content-box; } </style></head><body> <div class="box"></div></body></html>
background-clip背景裁切
background-clip控制背景显示多大的区域
background-clip: border-box|padding-box|content-box;
border-box:控制图片在border以内的区域也显示
padding-box:控制图片在padding以内的区域也显示
content-box:控制图片在内容以内的区域显示，示例代码：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> .box { width: 363px; height: 219px; border: 20px solid rgba(255, 0, 0, 0.5); padding: 20px; background-repeat: no-repeat; background-origin: border-box; background-image: url("./images/54.jpg"); background-clip: content-box; } </style></head><body> <div class="box"></div></body></html>
transition过渡
过渡: 就是给改变添加过程
transition: property duration timing-function delay;
transition-property:规定设置过渡效果的 CSS 属性的名称。
transition-duration：规定完成过渡效果需要多少秒或毫秒。
transition-timing-function：规定速度效果的速度曲线。
transition-delay：定义过渡效果何时开始。代码如下;
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>过渡</title> <style> .box { width: 20px; height: 80px; background-color: red; /*简单写法*/ /*transition: all 1s;*/ /*专业写法*/ transition-property:width; transition-duration: 1s; transition-delay: 1s; transition-timing-function: ease-in; /* linear 线性 匀速运动 */ /* ease 先快后慢 */ /* ease-in-out 先慢 后快 最后慢 */ /* ease-out 越来越慢 */ /* ease-in 越来越快 */ } .box:hover { width: 800px; background-color: green; } </style></head><body> <div class="box"></div></body></html>
transform方法有很多，下面介绍几种最基础的：
transform: translate(x,y);位置偏移，参数为偏移的距离transform: rotate(0deg);角度偏移，参数为旋转角度，正负对应顺逆时针transform: scale(0.5);缩放转换，参数大于1则放大，小于1则缩小transform-origin：left top;设置转换原点，参数可以是px或者百分比transform: skew(x, y);参数分别问沿着x轴以及y轴倾斜的角度
示例代码如下：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> .box { width: 200px; height: 200px; background-color: red; transform:rotate(100deg); } .box2 { width: 200px; height: 200px; background-color: red; transform: translate(200px, 300px); } .box3 { width: 200px; height: 200px; background-color: red; transition: all 2s; } .box3:hover{ width: 200px; height: 200px; background-color: red; transform: scale(0.5); } .box4{ position: absolute; top: 50%; left: 50%; margin-left: -155px; margin-top: -219px; width: 310px; height: 438px; } img{ width: 200px; position: absolute; bottom: 0; left: 0; box-shadow: 0 0 1px #f7f7f7; transition: all 1s; transform-origin: left top; } .box4:hover img:nth-child(1){ transform: rotate(60deg); } .box4:hover img:nth-child(2){ transform: rotate(120deg); } .box4:hover img:nth-child(3){ transform: rotate(180deg); } .box4:hover img:nth-child(4){ transform: rotate(240deg); } .box4:hover img:nth-child(5){ transform: rotate(300deg); } .box4:hover img:nth-child(6){ transform: rotate(360deg); } .box5{ width: 300px; height: 300px; background-color: yellow; margin-left: 1100px; transform: skew(152deg,60deg); } </style></head><body> <div class="box"></div> <div class="box2"></div> <div class="box3"></div> <div class="box4"> <img src="./images/pk1.png" alt=""> <img src="./images/pk1.png" alt=""> <img src="./images/pk1.png" alt=""> <img src="./images/pk1.png" alt=""> <img src="./images/pk1.png" alt=""> <img src="./images/pk1.png" alt=""> </div> <div class="box5"> 66666666666666666666666 </div></body></html>
动画
@keyframes:mymove 5s infinite 自定义动画名称，
animation 将动画与 div 元素绑定，
animation-iteration-count,控制动画的次数,infinite无数次，
animation-delay 控制动画开始时间，
animation-play-state 控制动画状态， paused(暂停) running(继续)
animation-direction: normal|alternate 控制动画播放是否循环，
animation-fill-mode:forwards;控制动画结束时的状态 backwards(回到动画的初始状态) forwards(停留在动画的结束状态)
示例代码：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> .box { position: relative; width: 500px; height: 500px; border: 2px solid red; margin: 50px auto; } i { position: absolute; top: -9px; left: -9px; width: 18px; height: 18px; background-color: chartreuse; border-radius: 50%; animation: move 3s;l } @keyframes move{ 0% { transform: translate(0px,0px ); } 100%{ transform: translate(500px,0px ); } } </style></head><body> <div class="box"> <i></i> </div></body></html>
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