JavaScript? ???? ???? ?? ?? ????
???? ?? ??? ???? ?? ??? ??????? ????? ?? ??? ? ????. JavaScript? ???? ? ??? ??? ? ????.
JavaScript ??
???? HTML5? ???? JavaScript ????
<code class="javascript">function getAverageRGB(imgEl) {
var blockSize = 5, // only visit every 5 pixels
defaultRGB = {r:0,g:0,b:0}, // for non-supporting envs
canvas = document.createElement('canvas'),
context = canvas.getContext && canvas.getContext('2d'),
data, width, height,
i = -4,
length,
rgb = {r:0,g:0,b:0},
count = 0;
if (!context) {
return defaultRGB;
}
height = canvas.height = imgEl.naturalHeight || imgEl.offsetHeight || imgEl.height;
width = canvas.width = imgEl.naturalWidth || imgEl.offsetWidth || imgEl.width;
context.drawImage(imgEl, 0, 0);
try {
data = context.getImageData(0, 0, width, height);
} catch(e) {
/* security error, img on diff domain */
return defaultRGB;
}
length = data.data.length;
while ( (i += blockSize * 4) < length ) {
++count;
rgb.r += data.data[i];
rgb.g += data.data[i+1];
rgb.b += data.data[i+2];
}
// ~~ used to floor values
rgb.r = ~~(rgb.r/count);
rgb.g = ~~(rgb.g/count);
rgb.b = ~~(rgb.b/count);
return rgb;
}</code>
???
???? ?? ??? ???? getAverageRGB ??? ???? ???? ?????. ??? ??? ?????. ? ??? ???, ?? ? ??? ?? ??? ?? ?? ?? ??? ?????.
?? ??
? ??? ??? ???? ?? ???? ???? HTML5 ??? ??? ?? ??????? ?????. ?? ??? Internet Explorer? ?? excanvas ?????? ???? ???? ??? ????? ?? ??????.
? ??? JavaScript? ???? ???? ?? ??? ??? ??? ? ????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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AI ? ???
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