從畫布上獲取像素顏色是否可以在鼠標下獲得RGB值像素？有完整的例子嗎？到目前為止，我的情況如下：<script>function draw() {
var ctx = document.getElementById('canvas').getContext('2d');
var img = new Image();
img.src = 'Your URL';
img.onload = function(){
ctx.drawImage(img,0,0);
};
canvas.onmousemove = function(e) {
var mouseX, mouseY;
if(e.offsetX) {
mouseX = e.offsetX;
mouseY = e.offsetY;
}
else if(e.layerX) {
mouseX = e.layerX;
mouseY = e.layerY;
}
var c = ctx.getImageData(mouseX, mouseY, 1, 1).data;
$('#ttip').css({'left':mouseX+20, 'top':mouseY+20}).html(c[0]+'-'+c[1]+'-'+c[2]);
};}</script>
怎么從畫布上獲取像素顏色
收到一只叮咚
2019-10-20 16:12:23
