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HTML5&jQuery指向时图片从灰度变成彩色

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 2014/1/6 10:31:50 阅读次数:3416

今天看到一个非常漂亮的图片展示效果,是用HTML5&jQuery做的,指向时图片从灰度变成彩色。(谨记图片不能跨域,否则报错)

SecurityError: The operation is insecure.

效果图如下:

HTML5&jQuery指向时图片从灰度变成彩色

源代码如下

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 
<title>HTML5 & jQuery - 指向时图片从灰度变成彩色</title> 
<style type="text/css"> 
body {
	background: #fff;
	color: #000;
	font: 14px/140% Arial, Helvetica, sans-serif;
	margin: 40px 0;
}
a {
	text-decoration: none;
	color: #86AEBB;
}
img {
	border: none;
}
h2 {
	font: bold 14px/110% Arial, Helvetica, sans-serif;
	margin: 0 0 30px;
	padding: 0 0 20px;
	color: #999;
	border-bottom: solid 1px #ccc;
	clear: both;
}
h3 {
	font: bold 16px/120% Arial, Helvetica, sans-serif;
	margin: 0;
}
#pagewrap {
	width: 948px;
	margin: 0 auto;
}
.item {
	width: 296px;
	margin: 0 0 30px 30px;
	float: left;
}
.item.first {
	clear: left;
	margin-left: 0;
}
.item img {
	opacity:0;
}
</style> 
<script src="http://www.86y.org/js/jquery.min.js" type="text/javascript"></script> 
<script type="text/javascript"> 
	
	// $(".item img").css({"display":"none");
	
	// On window load. This waits until images have loaded which is essential
	$(window).load(function(){
		
		// Fade in images so there isn't a color "pop" document load and then on window load
		$(".item img").animate({opacity:1},500);
		
		// clone image
		$('.item img').each(function(){
			var el = $(this);
			el.css({"position":"absolute"}).wrap("<div class='img_wrapper' style='display: inline-block'>").clone().addClass('img_grayscale').css({"position":"absolute","z-index":"998","opacity":"0"}).insertBefore(el).queue(function(){
				var el = $(this);
				el.parent().css({"width":this.width,"height":this.height});
				el.dequeue();
			});
			this.src = grayscale(this.src);
		});
		
		// Fade image 
		$('.item img').mouseover(function(){
			$(this).parent().find('img:first').stop().animate({opacity:1}, 1000);
		})
		$('.img_grayscale').mouseout(function(){
			$(this).stop().animate({opacity:0}, 1000);
		});		
	});
	
	// Grayscale w canvas method
	function grayscale(src){
        var canvas = document.createElement('canvas');
		var ctx = canvas.getContext('2d');
        var imgObj = new Image();
		imgObj.src = src;
		canvas.width = imgObj.width;
		canvas.height = imgObj.height; 
		ctx.drawImage(imgObj, 0, 0); 
		var imgPixels = ctx.getImageData(0, 0, canvas.width, canvas.height);
		for(var y = 0; y < imgPixels.height; y++){
			for(var x = 0; x < imgPixels.width; x++){
				var i = (y * 4) * imgPixels.width + x * 4;
				var avg = (imgPixels.data[i] + imgPixels.data[i + 1] + imgPixels.data[i + 2]) / 3;
				imgPixels.data[i] = avg; 
				imgPixels.data[i + 1] = avg; 
				imgPixels.data[i + 2] = avg;
			}
		}
		ctx.putImageData(imgPixels, 0, 0, 0, 0, imgPixels.width, imgPixels.height);
		return canvas.toDataURL();
    }
	    
</script> 
</head> 
<body> 
<div id="pagewrap">
	<h1>
		HTML5 & jQuery 指向时图片从灰度变成彩色 Demo</h1>
	<div class="item first">
		<div class="img_wrapper" style="display: inline-block; width: 296px; height: 170px;">
			<a href="http://themify.me"><img src="http://www.86y.org/upload/images/201416110039_themify.jpg" style="opacity:1;" /></a></div>
		<h3>
			Themify</h3>
	</div>
	<div class="item">
		<a href="#"><img src="http://www.86y.org/upload/images/201416110041_icondock.jpg" style="opacity: 1;" /></a>
		<h3>
			IconDock</h3>
	</div>
	<div class="item">
		<a href="#"><img src="http://www.86y.org/upload/images/201416110041_webdesignerwall.jpg" style="opacity: 1;" /></a>
		<h3>
			Web Designer Wall</h3>
	</div>
	<div class="item first">
		<a href="#"><img src="http://www.86y.org/upload/images/201416110041_koifish.jpg" style="opacity: 1;" /></a>
		<h3>
			Koi</h3>
	</div>
	<div class="item">
		<a href="#"><img src="http://www.86y.org/upload/images/201416110042_phoenix.jpg" style="opacity: 1;" /></a>
		<h3>
			Phoenix</h3>
	</div>
	<div class="item">
		<a href="#"><img src="http://www.86y.org/upload/images/201416110042_peacock.jpg" style="opacity: 1;" /></a>
		<h3>
			Peacock</h3>
	</div>
	<div class="item first">
		<a href="#"><img src="http://www.86y.org/upload/images/201416110042_flow.jpg" style="opacity: 1;" /></a>
		<h3>
			Flow</h3>
	</div>
	<div class="item">
		<a href="#"><img src="http://www.86y.org/upload/images/201416110043_webdesign136cover.jpg" style="opacity: 1;" /></a>
		<h3>
			Web Designer</h3>
	</div>
	<div class="item">
		<a href="#"><img src="http://www.86y.org/upload/images/201416110043_sakura.jpg" style="opacity: 1;" /></a>
		<h3>
			Sakura</h3>
	</div>
</div>
</body> 
</html>

(完)


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