网页鼠标悬停出现蒙层效果的不同实现方法

关于蒙层的实现方法

我们可以用css和jQuery这两个方法来实现

css方法:

首先看一下html代码:

 <div id="list">	
				<div class="list_">
					<img src="img/你是左脑人还是右脑人@2x.png"/>
					<div class="list_nav">
						<b>你是左脑人还是右脑人</b>
						<p>123</p>
					</div>
					<div class="mask">
						<p class="mask_title">你是左脑人还是右脑人</p>
						<a class="mask_btn">立即参与</a>
					</div>
				</div>

**css代码**:
   #list{
			position:relative;
			width: 1200px;
			margin: 0 auto;
			text-align: center;
		}
		.list_{
			display:  inline-block;
			/*box-shadow: 10px 10px #EEEEEE;*/		/*阴影部分*/
			position: relative;
			cursor: pointer;	
		}
		.list_ img{
		height: 190px;
		margin:18px 1% 1% 1%;
		}
		.list_nav b{
		font-size: 16px;
		color: #484848;
		margin-left:0px;
		}
		.list_nav p{
		font-size: 12px ;
		color: #aaaaaa;
		}
		.mask{
		width: 100%;
		height: 100%;
		position: absolute;
		top: 0px;
		display:none;
		background-color: rgba(0,0,0,0.5);
		color: #EEEEEE;
		font-size: 20px;
		}
		.mask_title{
		margin-top:20%;
		text-align: center;
		}
		.mask_btn{
		display: inline-block;
		text-decoration: none;
		color: #eee;
		width: 100px;
		height: 28px;
		line-height: 28px;
		font-size: 14px;
		text-align: center;
		border-radius:14px;
		background: #5691fe;
		list-style: none;
		cursor: pointer;
		margin-top: 20px;
		}
		.list_:hover .mask{
		 display: block;	
		}

jquery方法:

html代码:

   <div class="conten>
   <div class="conten_a">
				<img src="img/异性存在感测试@2x.png" width="100%"/>
				<h3>内外性格倾向测试</h3>
				<p>已有777人参与</p>
				<div class="mask">
						<p class="mask_title">你是左脑人还是右脑人</p>
						<a class="mask_btn">立即参与</a>
				</div>
    </div>`        
    **css代码**：
	/*图片布局*/
			.content{
			   width: 1200px;
			   margin: auto;
			/* background-color: grey;*/
         	   margin-top: 18px;
			}
			.conten_a {
				height: 240px;
				display: inline-block;
				width: 31%;
				margin: 10px;
				position: relative;
				box-shadow: 1px 3px 3px #888888;
			}
       /*题目描述*/
			 h3{
				font-size: 16px;
				color: #484848;
				font-weight: bold;
				position: relative;
				left: 16px;
			}
			p{
				font-size: 12px;
				color: #aaaaaa;
				position: relative;
				left: 16px;
			}
                 /*蒙层*/
         .mask{
         width: 100%;
          height: 100%;
           background-color: rgba(0,0,0,0.5);
        position: absolute;
        top: 0px;
        display: none;
        font-size: 20px;
          }
           .mask_title{
	margin-top: 20%;
	text-align: center;
       }
           .mask_btn{
		display: inline-block;
		text-decoration: none;
		color: #eee;
		width: 100px;
		height: 28px;
		line-height: 28px;
		font-size: 14px;
		text-align: center;
		border-radius:14px;
		background: #5691fe;
		list-style: none;
		cursor: pointer;
		margin-top: 20px;
		}

这里的css不用加.contert_a_:hover .mask{display: block;}

jquery代码:

<script type="text/javascript">
$('.conten_a').mouseenter(function(){
  $(this).find('.mask').slideDown(200);
});
$('.conten_a').mouseleave(function(){
    $(this).find('.mask').slideUp(200);
});
</script> 

*注意不要忘记引入jquery哦
效果图: