Im使用javascript/html5脚本在无鼠标悬停时高亮显示黑白图像,然后在悬停时返回彩色。尽管如此,我还是需要重新加载页面2-3次才能正常工作。我不知道如何使用它,javascript也不是我的强项。由于我使用的是Google CDN API,我想我不需要将其排队?目前,我的标题中有CDN链接。php
以下是脚本:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<;脚本>
$(document).ready(function(){
$(".attachment-full").fadeIn(500);
// clone image
$(\'.attachment-full\').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":"1","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
$(\'.attachment-full\').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();
}