如何在 JQuery 代码中引用我的文件夹中的图像?
我想将图像转换为灰度,在鼠标悬停时恢复为彩色。但是,我的图像引用不起作用。我已经尝试过通常的('folderofimages/myimage'),但这不起作用。我已经尝试了建议的方式('.myimage folderofimages'),但这也不起作用。
这是提供代码的网站,http://webdesignerwall.com/tutorials/html5-grayscale-image-hover/comment-page-4#comments
这是我的代码,
<script src="jquery.min.js" type="text/javascript"></script>
// On window load. This waits until images have loaded which is essential
$(window).load(function () {
// Fade in imagimages/homeannual.jpeges so there
// isn't a color "pop" document load and then on window load
$("images.homeannual").fadeIn(500);
// clone image
$('images.homeannual').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
$('images.homeannual').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();
}