day9作业
2018-11-09 本文已影响0人
逆流而上_2eb6
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
div{
position: fixed;
}
body{
width: 10000px;
height: 10000px;
position: fixed;
}
#big{
height: 400px;
width: 400px;
background-color: #FF7F50;
}
#small{
height: 100px;
width: 200px;
background-color: #5F9EA0;
}
#middle{
height: 200px;
width: 300px;
background-color: burlywood;
}
</style>
</head>
<body id="container">
<div id="big"></div>
<div id = "middle"></div>
<div id="small" ></div>
<script type="text/javascript">
var divs = document.querySelectorAll("div");
var body = document.getElementById("container");
body.addEventListener("mouseup",function(){
for(var i = 0;i<divs.length;i++ ){
divs[i].start = false;
}
})
function stop(evt){
var div = evt.target;
div.start = false;
div.stopPropagation;
}
function moveIt(div,evt){
var x = evt.clientX;
var y = evt.clientY;
// div.x;div.y是上一次代表的位置
var currentStyle = document.defaultView.getComputedStyle(div);
var newX = parseInt(currentStyle.left)+(x-div.x);
var newY = parseInt(currentStyle.top)+(y-div.y);
// currentStyle.left 是div 的left;
// x-div.x是鼠标位移的距离
// newX,newY是新的div位置
if (newX<0||newY<0) return;
div.style.left = newX+"px";
div.style.top = newY+"px";
// 更新div.x;div.y
div.x = x;
div.y = y;
}
for(var i = 0;i<divs.length;i++){
divs[i].addEventListener("mousedown",function(evt){
var div = evt.target;
div.start = true;
div.x = evt.clientX
div.y = evt.clientY
div.stopPropagation;
})
divs[i].addEventListener("mouseup",stop);
divs[i].addEventListener("mouseout",function(evt){
var div = evt.target;
if (!div.start) return;
body.addEventListener("mousemove",function(evtB){
if (!div.start) return;
moveIt(div,evtB);
})
});
divs[i].addEventListener("mousemove",function(evt){
var div = evt.target;
if (!div.start) return;
moveIt(div,evt);
div.stopPropagation;
})
}
</script>
</body>
</html>
