1.图片文字遮罩
.box{
width: 200px;
height: 300px;
margin: 50px auto 0;
border: 1px solid #000;
position: relative;
/*默认文字不可见*/
overflow: hidden;
}
.box img{
width: 200px;
height: 300px;
}
.box .pic_info{
width: 200px;
height: 200px;
background-color: rgba(0,0,0,0.5);
color: #fff;
/*定位使色块在图片正下方*/
position: absolute;
left: 0;
top: 300px;
transition: all 500ms cubic-bezier(0.470, -0.485, 0.460, 1.435);
}
.box:hover .pic_info{
/*色块上移*/
top:150px;
}
/*间距用p标签的margin，而不直接给.pic_info用padding，因为padding会改变盒子大小*/
.box .pic_info p{
margin: 20px;
line-height: 30px;
}
2._扩展二级菜单
如果，默认打开页面进来时二级菜单是隐藏的，需要点击才能展现二级菜单，再点击就是隐藏二级菜单。这里有两个点，实现展现和隐藏用display="block"和display="none",另外就是要做一个判断，if else的判断当前是block还是none。
.box{
width: 200px;
height: 300px;
margin: 0px auto 0;
border: 1px solid #000;
position: relative;
/*overflow: hidden;*/
float: left;
}
.box img{
width: 200px;
height: 300px;
}
.box .pic_info{
width: 200px;
height: 200px;
background-color: #000;
color: #fff;
position: absolute;
left: 200px;
top: 0px;
transition: all 500ms cubic-bezier(0.470, -0.600, 0.475, 1.605);
background-color: rgba(0,0,0,0.5);
display: none;
}
.box:hover .pic_info{
/*top: 150px;*/
display: block;
}
.box .pic_info p{
margin: 20px;
line-height: 30px;
}
3.变形
.box,.box2,.box3,.box4{
width: 200px;
height: 200px;
background-color: gold;
margin: 50px auto 0;
transition: all 1s ease;
}
.box:hover{
/*box的动画不会影响到box2*/
/*位移*/
transform: translate(50px,50px);
}
.box2:hover{
/*沿Z轴旋转360度*/
transform: rotate(360deg);
}
.box3:hover{
/*缩放*/
transform: scale(0.5,0.2);
}
.box4:hover{
/*斜切*/
/*transform: skew(45deg,0);*/
transform: skew(0,45deg);
}
4.元素旋转
/*旋转方向判断
1、X轴向右、Y轴向下、Z轴向屏幕外
2、让轴向对着自己，顺时针方向就是该轴向的旋转方向*/
.box{
width: 300px;
height: 300px;
background-color: gold;
margin: 50px auto 0;
transition: all 500ms ease;
/*设置盒子按3D空间显示*/
transform-style: preserve-3d;
transform: perspective(800px) rotateY(0deg);
}
.box:hover{
/*默认沿Z轴旋转*/
/*transform: rotate(45deg);*/
/*perspective设置透视距离，经验数值800比较符合人眼的透视效果*/
/*transform: perspective(800px) rotateX(45deg);*/
transform: perspective(800px) rotateY(-45deg);
}