CSS3实现毛玻璃效果_html/css_WEB-ITnose
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2022-03-08 19:44:04
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**首先看效果**
**引入下题**
HTML:
CSS3:
#blur{filter:blur(10px);-webkit-filter:blur(10px);-moz-filter:blur(10px);-ms-filter:blur(10px);-o-filter:blur(10px);}
**看个复杂点的例子**
查看演示
结 合CSS3毛玻璃实现 微信版的发红包看完整照片效果。可以完美的兼容移动端与PC端。代码如下:
html:
css3:
body,html{margin:0;padding:0;overflow:hidden}#content{position:relative;margin:0 auto;overflow:hidden}#blur{position:absolute;margin:0 auto;left:0;top:0;filter:blur(10px);-webkit-filter:blur(18px);-moz-filter:blur(18px);-ms-filter:blur(18px);-o-filter:blur(18px);z-index:0;display:block}#canvas{position:absolute;margin:0 auto;left:0;top:0;z-index:1;display:block}.button{padding:5px 10px;color:#fff;position:absolute;display:block;text-align:center;border-radius:4px;text-decoration:none;z-index:3}#button-reset{left:10%;bottom:5%;background-color:red}#button-show{right:10%;bottom:5%;background-color:green}
javascript:
var canWidth = window.innerWidth-20;var canHeight = window.innerHeight-20;var canvas=document.getElementById("canvas");var ctx = canvas.getContext("2d");canvas.width = canWidth;canvas.height = canHeight;var img = new Image();img.src = "img/4.jpg";var radius = 50;var leftMargin = 0,topMargin = 0;img.onload = function(){//初始化父容器的宽高使窗口与canvas宽高相同$("#content").css({"width":canvas.width + "px","height":canvas.height + "px"});//模糊图片与canva中绘制的图片(隐藏的清楚图片)宽高相同,别忘加px,否则计算出来的只是个值,不带px$("#blur").css("width",img.width + "px");$("#blur").css("height",img.height + "px");//左边距:(图片宽高 - canvas宽高) / 2;等于一边的边距宽高leftMargin = (img.width - canvas.width)/2;topMargin = (img.height - canvas.height)/2;//模糊图片的上边距与左边距$("#blur").css("top", String(-topMargin) + "px");$("#blur").css("left", String(-leftMargin) + "px");initCanvas();}function initCanvas(){var theleft = leftMargin Math.max(canvas.width,canvas.height)){clearInterval(animation);}draw(img,region);},30);}
查看演示
知识点:
- h5头部别忘引入viewport:
- filter : blur CSS3默认的滤镜模糊效果。
- canvas绘制图片,drawImage();
- canvas arc(); 用canvas绘制圆形;
- canvas clip(); 剪切区域;
- setinterval(); 与 clearInterval();