Question

如何用css或js jq在不是背景的图片上面加一层即透明又渐变得遮罩层

Answer 1

ie下面高版本的渐变又透明的才行。没法透明，可以考虑使用透明png。

rgba最后面的那个1可以改为0.8试试看，就变成透明的了。。

#box{width:200px;height:200px;overflow:hidden;position: relative;}
#box span{
display: block;width:100%;height:100%;position: absolute;top:0;left:0;
background-image:linear-gradient(bottom, rgba(0,0,0,1) 0%,rgba(255,255,255,1) 100%);
background-image:-o-linear-gradient(bottom, rgba(0,0,0,1) 0%,rgba(255,255,255,1) 100%);
background-image:-moz-linear-gradient(bottom, rgba(0,0,0,1) 0%,rgba(255,255,255,1) 100%);
background-image:-webkit-linear-gradient(bottom, rgba(0,0,0,1) 0%,rgba(255,255,255,1) 100%);
background-image:-ms-linear-gradient(bottom, rgba(0,0,0,1) 0%,rgba(255,255,255,1) 100%);
filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#000000,endColorstr=#ffffff,grandientType=1);
}


<div id="box">
	<img src="https://ss3.baidu.com/-fo3dSag_xI4khGko9WTAnF6hhy/news/q=100/sign=2c88d7ac67d0f703e0b291dc38fb5148/3bf33a87e950352a60c7a4b35643fbf2b3118be3.jpg">
	<span></span>
</div>