//封裝勻速運(yùn)動(dòng)
//參數(shù)：
// 1、dom對(duì)象
// 2、樣式屬性（top，left，width，height，opacity等等）
// 3、起始位置，結(jié)束位置
// 4、速度：時(shí)間間隔，步長(zhǎng)
// 5、方向：
//返回值
function moveObj(domObj,attr,startValue,endValue,timeSpace,step,direction) {
 let currValue = startValue;
 let myTimer = setInterval(function(){
 //1、改變數(shù)據(jù)
 currValue = currValue+direction*step;
 //2、判斷邊界
 // if(currValue>=endValue){//??
 // currValue = endValue;//??
 // window.clearInterval(myTimer);
 // }
 if(Math.abs(currValue-endValue)<step){
  currValue = endValue;
  window.clearInterval(myTimer);
 }
 //3、改變外觀
 if(attr=="opacity"){
  domObj.style[attr] = currValue;
 }else{
  domObj.style[attr] = currValue+"px";
 }
 },timeSpace);
}
//封裝勻速運(yùn)動(dòng)
//參數(shù)：
// 1、dom對(duì)象
// 2、樣式屬性（top，left，width，height，opacity等等）
// 3、結(jié)束位置
// 4、時(shí)長(zhǎng)：
//返回值
function moveObj02(domObj,attr,endValue,timeLong) {
 let startValue = parseFloat(getStyle(domObj,attr));//??
 let direction= endValue-startValue>0?1:-1;//??
 let timeSpace = 10;
 let step = Math.abs(endValue-startValue)/(timeLong/timeSpace) // endValue-startValue/步子數(shù);//
 let currValue = startValue;
 let myTimer = setInterval(function(){
 //1、改變數(shù)據(jù)
 currValue = currValue+direction*step;
 //2、判斷邊界
 if(Math.abs(currValue-endValue)<step){
  currValue = endValue;
  window.clearInterval(myTimer);
 }
 //3、改變外觀
 if(attr=="opacity"){
  domObj.style[attr] = currValue;
 }else{
  domObj.style[attr] = currValue+"px";
 }
 },timeSpace);
}
//封裝拋物線運(yùn)動(dòng)(右開口為例)
//參數(shù)：
// dom對(duì)象
// 起點(diǎn)
// 終點(diǎn)
// 總時(shí)長(zhǎng)
//
//返回值：無
function parabola(domObj,startPoint,endPoint,timeLong,func){
 //一、初始化
 let offsetX = endPoint.x-startPoint.x;
 let offsetY = endPoint.y-startPoint.y;
 let p = (offsetY*offsetY)/(2*offsetX);
 let left1 = 0;
 domObj.style.left = startPoint.x+"px";
 domObj.style.top = startPoint.y+"px";
 let timeSpace = 10;
 let step = Math.abs(endPoint.x-startPoint.x)/(timeLong/timeSpace) // endValue-startValue/步子數(shù);//
 //二、啟動(dòng)定時(shí)器
 let myTimer = setInterval(function(){
 //1、改變數(shù)據(jù)
 left1=left1+step;
 let top1=Math.sqrt(2*p*left1);
 //2、判斷邊界
 if(left1>=offsetX){
  left1 = offsetX;
  top1=Math.sqrt(2*p*left1);
  window.clearInterval(myTimer);
  if(func){
  func();
  }
 }
 //3、改變外觀
 domObj.style.left = left1+startPoint.x+"px";
 domObj.style.top = top1+startPoint.y+"px";
 },timeSpace);
}
//淡入：
//參數(shù)：
// dom對(duì)象
// 時(shí)長(zhǎng)；
//返回值：無
function fadeIn(domObj,timeLong){
 domObj.style.opacity = 0;
 moveObj02(domObj,"opacity",1,timeLong);
}
//淡出：
//參數(shù)：
// dom對(duì)象
// 時(shí)長(zhǎng)；
//返回值：無
function fadeOut(domObj,timeLong){
 domObj.style.opacity = 1;
 moveObj02(domObj,"opacity",0,timeLong);
}
//淡入和淡出：
//參數(shù)：
// domObjIn：淡入的dom對(duì)象
// domObjOut：淡出的dom對(duì)象
// 時(shí)長(zhǎng)；
//返回值：無
function fadeInOut(domObjIn,domObjOut,timeLong,func){
 domObjIn.style.opacity = 0;
 domObjOut.style.opacity = 1;
 let startValue = 0;
 let endValue = 1;
 let direction= 1;
 let timeSpace = 10;
 let step = Math.abs(endValue-startValue)/(timeLong/timeSpace) // endValue-startValue/步子數(shù);//
 let currValue = startValue;
 let myTimer = setInterval(function(){
 //1、改變數(shù)據(jù)
 currValue = currValue+direction*step;
 //2、判斷邊界
 if(Math.abs(currValue-endValue)<step){
  currValue = endValue;
  window.clearInterval(myTimer);
  func&&func();
 }
 //3、改變外觀
 domObjIn.style.opacity = currValue;
 domObjOut.style.opacity = 1-currValue;
 },timeSpace);
}
//多屬性的運(yùn)動(dòng)
//參數(shù)：
// 1、dom對(duì)象
// 2、每個(gè)樣式屬性的結(jié)束值
// 4、時(shí)長(zhǎng)：
//返回值
//調(diào)用示例：
/*
animate($("box"),{
 "width":600,
 "height":400,
 "left":50
},2000)
*/
function animate(domObj,endObj,timeLong) {
 // let startValue = parseFloat(getStyle(domObj,attr));//??
 let startObj = {}
 for(let key in endObj){
 startObj[key] = parseFloat(getStyle(domObj,key));
 }
 // let direction= endValue-startValue>0?1:-1;//??
 let directionObj = {};
 for(let key in endObj){
 directionObj[key] = endObj[key]>startObj[key]?1:-1;
 }
 let timeSpace = 10;
 // let step = Math.abs(endValue-startValue)/(timeLong/timeSpace) // endValue-startValue/步子數(shù);//
 let stepObj = {};
 for(let key in endObj){
 stepObj[key] = Math.abs(endObj[key]-startObj[key] )/(timeLong/timeSpace);
 }
 //let currValue = startValue;
 let currObj = {};
 for(let key in endObj){
 currObj[key] = startObj[key];
 }
 let myTimer = setInterval(function(){
 //1、改變數(shù)據(jù)
 //currValue = currValue+direction*step;
 for(let key in endObj){
  currObj[key] = currObj[key]+directionObj[key]*stepObj[key];
 }
 //2、判斷邊界
 let firstKey = Object.keys(endObj)[0];
 if(Math.abs(currObj[firstKey]-endObj[firstKey])<stepObj[firstKey]){
  for(let key in endObj){
  currObj[key] = endObj[key];
  }
  window.clearInterval(myTimer);
 }
 //3、改變外觀
 for(let key in endObj){
  if(key=="opacity"){
  domObj.style[key] = currObj[key];
  }else{
  domObj.style[key] = currObj[key]+"px";
  }
 }
 },timeSpace);
}