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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
#div_wrapper {
width: 500px;
height: 500px;
position: absolute;
top: 50%;
left: 50%;
margin-left: -250px;
margin-top: -250px;
border: 1px solid silver;
}
#div_01 {
position: absolute;
width: 10px;
height: 100%;
/*background-color: red;*/
top: 0px;
right: 0px;
}
#div_01:hover {
cursor: e-resize;
}
#div_02 {
position: absolute;
width: 100%;
height: 10px;
/*background-color: red;*/
bottom: 0px;
left: 0px;
}
#div_02:hover {
cursor: n-resize;
}
#div_03 {
position: absolute;
width: 10px;
height: 10px;
/*background-color:black;*/
right: 0px;
bottom: 0px;
}
#div_03:hover {
cursor: nw-resize;
}
#div_0 {
text-align: center;
height: 30px;
width: 100%;
background-color: silver;
margin: 0px;
}
#div_0 p {
margin: 0px;
line-height: 30px;
font: bold 17px 微软雅黑, arial;
}
</style>
<script type="text/javascript">
var offsetLeft, //点击鼠标的实时位置记录 x
offsetTop, //点击鼠标的实时位置记录 y
timer,
mouse_x, //鼠标在操作元素上的实时位置X
mouse_y, //鼠标在操作元素上的实时位置Y
margin_left, //横向移动偏移量
margin_top; //纵向移动偏移量
var to_x, //
to_y;
function drag(id, type) {
var item = document.getElementById(id); //正在操作的div元素
document.onmousemove = function(e) { //在操作元素上移动鼠标
var e = e || window.event;
mouse_x = e.pageX; //将鼠标的实时位置缓存到mouse_x
mouse_y = e.pageY; //将鼠标的实时位置缓存到mouse_y
};
item.onmousedown = function() { //鼠标在操作元素上按下时的回调函数
// offsetTop以及offsetTop必须要放在mousedown里面，每次都要计算
offsetLeft = item.offsetLeft; //点击鼠标的实时位置记录 x
offsetTop = item.offsetTop; //点击鼠标的实时位置记录 y
margin_top = mouse_y - offsetTop; //纵向移动偏移量
margin_left = mouse_x - offsetLeft; //横向移动偏移量
console.log("margin_top", margin_top);
console.log("margin_top", margin_left);
timer = setInterval(function() {
if (timer) {
var max_with = 800,
max_height = 600;
to_x = mouse_x - margin_left; //
to_y = mouse_y - margin_top;
to_x = Math.min(to_x, max_with);
to_y = Math.min(to_y, max_height);
// 一定要记得加“px"
if (type == "x") {
item.style.left = to_x + "px";
document.getElementById("div_wrapper").style.width = to_x + 10 + "px";
document.getElementById("div_03").style.left = to_x + "px";
} else if (type == "y") {
item.style.top = to_y + "px";
document.getElementById("div_03").style.top = to_y + "px";
document.getElementById("div_wrapper").style.height = to_y + 10 + "px";
}
//默认为上下左右移动
else {
item.style.left = to_x + "px";
item.style.top = to_y + "px";
// Style刷新
document.getElementById("div_01").style.left = to_x + "px";
document.getElementById("div_02").style.top = to_y + "px";
document.getElementById("div_wrapper").style.width = to_x + 10 + "px";
document.getElementById("div_wrapper").style.height = to_y + 10 + "px";
}
}
}, 5);
};
document.onmouseup = function() {
clearInterval(timer);
timer = 0;
}
}
window.onload = function() {
drag("div_01", "x");
drag("div_02", "y");
drag("div_03");
// drag("div_wrapper");
}
</script>
</head>
<body>
<div id="div_wrapper">
<div id="div_0">
<p>拖拽可更改DIV大小</p>
</div>
<div id="div_01"></div>
<div id="div_02"></div>
<div id="div_03"></div>
</div>
</body>
</html>