完美运动（链式运动）JS框架

//获取非行内样式

function getStyle(obj,attr){
return obj.currentStyle ? obj.currentStyle[attr] : getComputedStyle(obj,1)[attr];

}

//完美运动框架

//{width:300,height:300,opacity:30}

function startMove(obj,json,fn){
//1、清除定时器
clearInterval(obj.timer);
//2、开启新的计时器
obj.timer = setInterval(function(){
var stop = true; //假设JSON中的所有对象都已到达目标
for(var attr in json){
//1、获取当前值
var cur = 0;
if(attr == "opacity"){
cur = parseInt(parseFloat(getStyle(obj,attr)) * 100);
}else{
cur = parseInt(getStyle(obj,attr));
}
//2、设置速度
var speed = (json[attr] - cur) / 8;
speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);
//3、检测对象是否到达目标
if(json[attr] != cur){
stop = false;
}
//4、运动
if(attr == "opacity"){
obj.style.opacity = (cur + speed) / 100;
obj.style.filter = "alpha(opacity=" + (cur + speed) + ")";
}else{
obj.style[attr] = cur + speed + "px";
}
}
//5、当所有对象都打成目标时，停止计时器
if(stop){clearInterval(obj.timer);
//fn && fn();
if(typeof fn == "function"){
fn();
}
}
},30);

}