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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Document</title>
</head>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
.drawbox {
width: 1100px;
height: 600px;
background-color: skyblue;
position: relative;
}
</style>
<body>
<div class="drawbox"></div>
<script>
/*
1.鼠标点击时可以在画板上画画
如果鼠标双击那么停止
移动进画板颜色改变移除时颜色改变
*/
var darwbox = document.querySelector("div");
darwbox.onmouseenter = function() {
darwbox.style.backgroundColor = "red";
};
darwbox.onmouseleave = function() {
darwbox.style.backgroundColor = "skyblue";
};
var istrue = false;
darwbox.onmousedown = function(e) {
istrue = true;
};
darwbox.onmousemove = function(e) {
if (istrue == true) {
var x = e.pageX;
var y = e.pageY;
var circle = document.createElement("div");
circle.style.width = "10px";
circle.style.height = "10px";
circle.style.backgroundColor = "#fff";
circle.style.position = "absolute";
circle.style.left = x - 5 + "px";
circle.style.top = y - 5 + "px";
circle.style.borderRadius = "50%";
darwbox.appendChild(circle);
}
};
darwbox.onmouseup = function(e) {
istrue = false;
};
</script>
</body>
</html>
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