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html5 worker 實例(二) 圖片變換效果
編輯:HTML5詳解     
worker的js代碼img.JS 

復制代碼代碼如下:
onmessage = function(e) { 
postMessage(filter(e.data)) 
}; 
function filter(imgd) { 
var pix = imgd.pixels.data; 
var xcord = imgd.x / 1000; 
var ycord = imgd.y / 1000; 
for ( var i = 0, n = pix.length; i < n; i += 4) { 
var grayscale = pix[i] * xcord + pix[i + 1] * .59 + pix[i + 2] * .11; 
pix[i] = grayscale; // red 
pix[i + 1] = grayscale; // green 
pix[i + 2] = grayscale; // blue 

imgd['pixels'].data = pix; 
return imgd; 


Html代碼 

復制代碼代碼如下:
<!DOCTYPE Html> 
<Html> 
<head> 
<title>test2.Html</title> 
<meta http-equiv="keywords" content="keyword1,keyword2,keyWord3"> 
<meta http-equiv="description" content="this is my page"> 
<meta http-equiv="content-type" content="text/Html; charset=UTF-8"> 
<!--<link rel="stylesheet" type="text/css" href="./styles.CSS">--> 
<script type="text/Javascript" src="../js/jquery-1.8.0.min.JS"></script> 
</head> 
<body> 
<canvas id="myCanvas" width="640" height="480"></canvas> 
<img src="../image/psu[4].jpg" class="onHover"> //注意,自己在這裡插入一張圖片,否則沒用效果 
<script type="text/Javascript"> 
function process(img,x,y){ 
var canvas = document.getElementById("myCanvas"); 
var context = canvas.getContext('2d'); 
context.drawImage(img, 0, 0); 
var pixels = context.getImageData(0,0,img.width,img.height); 
var worker = new Worker("img.JS"); 
var obj = { 
pixels: pixels, 
x:x, 
y:y 

worker.postMessage(obj); 
worker.onmessage = function(e) { 
if (typeof e.data === "string") { 
console.log("Worker: " + e.data); 
return; 

var new_pixels = e.data.pixels; // Pixels from worker 
context.putImageData(new_pixels, 0, 0); 
img.src = canvas.toDataURL(); // And then to the img 


</script> 
<script type="text/Javascript"> 
$(function(){ 
$(".onHover").on("mouSEOver", function(){ 
var x =this.width; 
var y = this.height; 
console.log("X: " + x + " Y: " + y); 
process(this, x, y); 
}); 
}) 
</script> 
</body> 
</Html> 

是執行上面的例子的時候 ,要自己引入jquery包,並且在Html頁面上的img標簽上放入自己要變換的圖片。然後部署到服務器,打開頁面,當鼠標移動到圖片的 上面的時候就會發生變換,在這裡執行變換功能的函數有worker負責,隨意不影響頁面本身的效率,類似於Java語言中的多線程。
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