保存成a.html文件，双击打开
<!doctype html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<title>log_tracks</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<style>
*{
margin:0;
padding:0;
border:0;
}
.track-monitor{
background-color:orange;
}
.track-pad{
height:800px;
background-color:green;
}
.track-coordinate{
background-color:purple;
color:white;
height:25px;
line-height:25px;
font-size:12px;
}
.track-coordinate-list{
font-size:12px;
width:100%;
word-break:break-word;
}
</style>
<script>
window.addEventListener('load',function(){
var pad = document.getElementsByClassName('track-pad')[0];
var monitor = document.getElementsByClassName('track-monitor')[0];
var coordinate = document.getElementsByClassName('track-coordinate')[0];
var clist = document.getElementsByClassName('track-coordinate-list')[0];
var reset = document.getElementsByTagName('button')[0];
var context = monitor.getContext('2d');
var cset = [];
var startx = 0, starty = 0;
$('div').mousedown(mouseState).mouseup(mouseState);
function fixSize(){monitor.width = window.innerWidth;};
function log(e){
if(cset.length == 0){
context.moveTo(e.x,e.y);
}else{
context.strokeStyle = 'white';
context.lineTo(e.x,e.y);
context.stroke();
}
if(e.x-startx == e.x && e.y-starty == e.y){
startx = e.x;
starty = e.y;
}
coordinate.innerHTML = '(' + (e.x-startx)+', '+(e.y-starty) + ')';
cset.push(coordinate.innerHTML);
clist.innerHTML = cset.join(', ');
}
function mouseState(e) {
if (e.type == "mouseup") {
$('#logs').append('<br/>'+cset.join(', '));
clist.innerHTML = cset.join('');
cset = [];
pad.removeEventListener("mousemove", log);
}
if (e.type == "mousedown") {
startx = 0; starty = 0;
pad.addEventListener('mousemove',log);
}
}
reset.addEventListener('click',function(){
fixSize();
cset = [];
clist.innerHTML = '';
coordinate.innerHTML='在绿色的方块中滑动鼠标';
});
fixSize();
});
</script>
</head>
<body>
<div class="stage">
<div class="track-pad"></div>
<canvas width="100" height="800" class="track-monitor"></canvas>
<div class="track-coordinate">在绿色的方块中滑动鼠标</div>
<button>重置</button>
<div>
<div id="logs"></div>
<div class="track-coordinate-list"></div>
</div>
</div>
</body>
</html>
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