上传各种尺寸的头像,处理成正圆形的方法:【孟祥阳】

当用户上传各种尺寸的图片时,比如图片时长方形,这时我们在将图片处理成正圆时,就会出现一些问题,下面的方法,可以方便解决此问题。。

 比例获取方法:Firefox浏览器-控制台运行

var canvas=document.createElement('canvas')
canvas.width=1
canvas.height=1
canvas.toDataURL('image/png')

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>上传各种尺寸的头像,处理成正圆形</title>
<style>
body{ background:#CCC}
img{ width:30%; display:block;}
</style>

</head>


<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAC0lEQVQIW2NkAAIAAAoAAggA9GkAAAAASUVORK5CYII=" style="background-image:url(http://www.baidu.com/img/bd_logo1.png); border:2px solid #FFF; border-radius:100%; background-size:cover; background-position:center" />

<br />


<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAC0lEQVQIW2NkAAIAAAoAAggA9GkAAAAASUVORK5CYII=" style="background-image:url(http://www.baidu.com/img/bd_logo1.png); border:2px solid #FFF;  background-size:cover; background-position:center" />

<br />
<br />
<img src="http://www.baidu.com/img/bd_logo1.png" style=" border-radius:100%; " />

<body>
</body>
</html>

 

 

posted @ 2015-06-09 17:03  Shimily  阅读(1229)  评论(0)    收藏  举报