我需要通过Javascript将鼠标事件添加到下面的代码中...我已经添加了触摸事件以便在桌面浏览器中进行测试我需要添加鼠标事件..我尝试将鼠标事件添加到addEventListener但似乎不起作用我不太确定出了什么问题...
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=768px, maximum-scale=1.0" />
<title>rsaCanvas</title>
<script type="text/javascript" charset="utf-8">
window.addEventListener('load',function(){
// get the canvas element and its context
var canvas = document.getElementById('rsaCanvas');
var insertImage = document.getElementById('insert');
var context = canvas.getContext('2d');
//load image and annotation method
var loadData = {
imageLoad: function(){
var img = new Image();
img.src = 'the_scream.jpg';
context.drawImage(img,0,0);
}
};
// create a drawer which tracks touch movements
var drawer = {
isDrawing: false,
touchstart: function(coors){
context.beginPath();
context.moveTo(coors.x, coors.y);
this.isDrawing = true;
},
touchmove: function(coors){
if (this.isDrawing) {
context.lineTo(coors.x, coors.y);
context.stroke();
}
},
touchend: function(coors){
if (this.isDrawing) {
this.touchmove(coors);
this.isDrawing = false;
}
}
};
// create a function to pass touch events and coordinates to drawer
function draw(event){
// get the touch coordinates
var coors = {
x: event.targetTouches[0].pageX,
y: event.targetTouches[0].pageY
};
// pass the coordinates to the appropriate handler
drawer[event.type](coors);
}
// attach the touchstart, touchmove, touchend event listeners.
canvas.addEventListener('touchstart',draw, false);
canvas.addEventListener('touchmove',draw, false);
canvas.addEventListener('touchend',draw, false);
insertImage.addEventListener('click',loadData.imageLoad, false);
// prevent elastic scrolling
document.body.addEventListener('touchmove',function(event){
event.preventDefault();
},false); // end body.onTouchMove
},false); // end window.onLoad
</script>
<style>
#rsaCanvas{border:5px solid #000;}
</style>
</head>
<body>
<div id="container">
<canvas id="rsaCanvas" width="400" height="500">
Sorry, your browser is not supported.
</canvas>
<button id="insert">Insert Image</button>
</div>
</body>
</html>