javascript截图 jQuery插件imgAreaSelect使用详解

function preview(img, selection){ 
var scaleX = 100 / selection.width; 
var scaleY = 100 / selection.height; 

$('#biuuu + div > img').css({ 
width: Math.round(scaleX  400) + 'px', 
height: Math.round(scaleY  300) + 'px', 
marginLeft: '-' + Math.round(scaleX  selection.x1) + 'px', 
marginTop: '-' + Math.round(scaleY  selection.y1) + 'px' 
}); 
} 

$(document).ready(function () { 
$('<div><img src="biuuu.jpg" style="position: relative;" /></div>') 
.css({ 
float: 'left', 
position: 'relative', 
overflow: 'hidden', 
width: '100px', 
height: '100px' 
}) 
.insertAfter($('#biuuu')); 
}); 

$(window).load(function () { 
$('#biuuu').imgAreaSelect({ aspectRatio: '1:1', onSelectChange: preview }); 
}); 

<div class="container"> 
<p> 
<img id="biuuu" src="biuuu.jpg" title="biuuu" style="float: left; margin-right: 10px;" /> 
</p> 
</div>