JavaScript 拖拽加动画效果
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本文目录结构
拖拽加动画效果
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>Duang！拖拽加效果</title>
<style>
body{-webkit-user-select: none;-moz-user-select: none;}
#div1{width: 100px;height: 100px;background: orange;position: absolute;top: 0;left: 0;cursor: move;}
</style>
</head>
<body>
<div id="div1">拖拽效果</div>
</body>
</html>
<script>
var oDiv=document.getElementById("div1");
oDiv.onmousedown=down;
/*第一步*/
function down(e){
e=e||window.event;
this.x=this.offsetLeft;
this.y=this.offsetTop;
this.mouseX=e.clientX;
this.mouseY=e.clientY;
if(this.setCapture){
//捕捉鼠标焦点的；IE的解决方法；
this.setCapture();
this.onmousemove=move;
this.onmouseup=up;
}else{
var _move=bindThis(this,move);
var _up=bindThis(this,up);
document.onmousemove=_move;
document.onmouseup=_up;
}
};
/*第二步*/
function move(e){
this.style.top=this.y+(e.clientY-this.mouseY)+"px";
this.style.left=this.x+(e.clientX-this.mouseX)+"px";
/*加动画效果的代码*/
if(!this.prevX){
//记录第一次/上一次move事件触发的时候鼠标X轴位置;
this.prevX= e.clientX;
}else{
this.speed= e.clientX-this.prevX;//速度=这次位置-上次位置；
this.prevX= e.clientX;//改变this.prevX；记录本次的位置
console.log(this.speed);
//两次move事件之间的事件间大体是一样的；
// 速度=单位时间的距离;
}
/*动画代码结束*/
};
/*第三步*/
function up(e){
/*IE解决鼠标丢失焦点*/
if(this.releaseCapture){
this.releaseCapture();
this.onmousemove=null;
this.onmouseup=null;
}else{
document.onmousemove=null;
document.onmouseup=null;
}
fly.call(this);
};
function fly(){
//谁执行这个动画；this就是谁；
this.speed*=0.93;
this.style.left=this.offsetLeft+this.speed+"px";
/*定时器的this是window；*/
window.setTimeout(bindThis(this,arguments.callee),30)//arguments.callee就是函数本身的意思，也可以写fly；
}
function bindThis(obj,fn){
//绑定this关键字
return function(e){fn.call(obj,e)}
}
</script>
拖拽加动画效果-过界判断
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>Duang！拖拽加效果</title>
<style>
body{-webkit-user-select: none;-moz-user-select: none;}
#div1{width: 100px;height: 100px;background: orange;position: absolute;top: 0;left: 0;cursor: move;}
</style>
</head>
<body>
<div id="div1">拖拽效果</div>
</body>
</html>
<script>
var oDiv=document.getElementById("div1");
oDiv.onmousedown=down;
/*第一步*/
function down(e){
e=e||window.event;
this.x=this.offsetLeft;
this.y=this.offsetTop;
this.mouseX=e.clientX;
this.mouseY=e.clientY;
if(this.setCapture){
//捕捉鼠标焦点的；IE的解决方法；
this.setCapture();
this.onmousemove=move;
this.onmouseup=up;
}else{
var _move=bindThis(this,move);
var _up=bindThis(this,up);
document.onmousemove=_move;
document.onmouseup=_up;
}
};
/*第二步*/
function move(e){
this.style.top=this.y+(e.clientY-this.mouseY)+"px";
this.style.left=this.x+(e.clientX-this.mouseX)+"px";
/*加动画效果的代码*/
if(!this.prevX){
//记录第一次/上一次move事件触发的时候鼠标X轴位置;
this.prevX= e.clientX;
}else{
this.speed= e.clientX-this.prevX;//速度=这次位置-上次位置；
this.prevX= e.clientX;//改变this.prevX；记录本次的位置
console.log(this.speed);
//两次move事件之间的事件间大体是一样的；
// 速度=单位时间的距离;
}
/*动画代码结束*/
};
/*第三步*/
function up(e){
/*IE解决鼠标丢失焦点*/
if(this.releaseCapture){
this.releaseCapture();
this.onmousemove=null;
this.onmouseup=null;
}else{
document.onmousemove=null;
document.onmouseup=null;
}
fly.call(this);
};
function fly(){
clearTimeout(this.flytimer);
var maxRight=(document.documentElement.clientWidth||document.body.clientWidth)-this.offsetWidth;
console.log("最大的右侧是"+maxRight);
this.speed*=0.93;
if(this.offsetLeft+this.speed>=maxRight){
this.style.left=maxRight+"px";
this.speed*=-1;
}else if(this.offsetLeft+this.speed<=0){
this.style.left=0;
this.speed*=-1;
}else{
this.style.left=this.offsetLeft+this.speed+"px";
}
this.flytimer=window.setTimeout(bindThis(this,arguments.callee),30);
}
function bindThis(obj,fn){
//绑定this关键字
return function(e){fn.call(obj,e)}
}
</script>
拖拽加动画效果-自由落体
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>Duang！拖拽加效果,再加自由落体</title>
<style>
body{-webkit-user-select: none;-moz-user-select: none;}
#div1{width: 100px;height: 100px;background: orange;position: absolute;top: 0;left: 0;cursor: move;}
</style>
</head>
<body>
<div id="div1">拖拽效果</div>
</body>
</html>
<script>
var oDiv=document.getElementById("div1");
oDiv.onmousedown=down;
/*第一步*/
function down(e){
e=e||window.event;
this.x=this.offsetLeft;
this.y=this.offsetTop;
this.mouseX=e.clientX;
this.mouseY=e.clientY;
if(this.setCapture){
//捕捉鼠标焦点的；IE的解决方法；
this.setCapture();
this.onmousemove=move;
this.onmouseup=up;
}else{
var _move=bindThis(this,move);
var _up=bindThis(this,up);
document.onmousemove=_move;
document.onmouseup=_up;
}
clearTimeout(this.flytimer);
clearTimeout(this.droptimer);
};
/*第二步*/
function move(e){
this.style.top=this.y+(e.clientY-this.mouseY)+"px";
this.style.left=this.x+(e.clientX-this.mouseX)+"px";
/*加动画效果的代码*/
if(!this.prevX){
//记录第一次/上一次move事件触发的时候鼠标X轴位置;
this.prevX= e.clientX;
}else{
this.speed= e.clientX-this.prevX;//速度=这次位置-上次位置；
this.prevX= e.clientX;//改变this.prevX；记录本次的位置
//两次move事件之间的事件间大体是一样的；
// 速度=单位时间的距离;
}
/*动画代码结束*/
};
/*第三步*/
function up(e){
/*IE解决鼠标丢失焦点*/
if(this.releaseCapture){
this.releaseCapture();
this.onmousemove=null;
this.onmouseup=null;
}else{
document.onmousemove=null;
document.onmouseup=null;
}
// fly.call(this);
// drop.call(this);
};
/*左右反弹*/
function fly(){
clearTimeout(this.flytimer);
var maxRight=(document.documentElement.clientWidth||document.body.clientWidth)-this.offsetWidth;
this.speed*=0.93;
if(this.offsetLeft+this.speed>=maxRight){
this.style.left=maxRight+"px";
this.speed*=-1;
}else if(this.offsetLeft+this.speed<=0){
this.style.left=0;
this.speed*=-1;
}else{
this.style.left=this.offsetLeft+this.speed+"px";
}
if(Math.abs(this.speed)>=0.5){/*定时器停止的条件*/
this.flytimer=window.setTimeout(bindThis(this,arguments.callee),30);
}
}
/*自由落体*/
var g=9.8;
var flag=0;
function drop(){
clearTimeout(this.droptimer);
var maxBottom=(document.documentElement.clientHeight||document.body.clientHeight)-this.offsetHeight;
if(!this.dropSpeed){
this.dropSpeed=g;
}else{
this.dropSpeed+=g;
}
/*下面是摩擦系数*/
this.dropSpeed*=0.93;
/*下面是边界判断*/
if(this.offsetTop+this.dropSpeed>=maxBottom){
this.style.top=maxBottom+"px";
this.dropSpeed*=-1;
flag++;
}else{
this.style.top=this.offsetTop+this.dropSpeed+"px";
flag=0;
}
if(flag<2){
this.droptimer=window.setTimeout(bindThis(this,arguments.callee),30);
}
}
function bindThis(obj,fn){
return function(e){fn.call(obj,e)}
}
</script>
