animate js动画函数

function animate(obj,targetJSON,time,callback){
var interval = 10;
if(window.navigator.userAgent.indexOf("MSIE") != -1){
interval = 50;
}
var semophorJSON = {};
for(var k in targetJSON){
semophorJSON[k] = parseFloat(fetchComputedStyle(obj,k));
}
var maxCount = time / interval;
var stepJSON = {};
for(var k in targetJSON){
targetJSON[k] = parseFloat(targetJSON[k]);
stepJSON[k] = (targetJSON[k] - semophorJSON[k]) / maxCount;
}
var count = 0;
var t1 = new Date();
var timer = setInterval(function(){
for(var k in semophorJSON){
semophorJSON[k] += stepJSON[k];
if(k != "opacity"){
obj.style[k] = semophorJSON[k] + "px";
}else{
obj.style[k] = semophorJSON[k];
obj.style.filter = "alpha(opacity = " + (semophorJSON[k] * 100) + ")";
}
}
count++;
if(count >= maxCount){
for(var k in targetJSON){
if(k != "opacity"){
obj.style[k] = targetJSON[k] + "px";
}else{
obj.style[k] = targetJSON[k];
obj.style.filter = "alpha(opacity = " + (targetJSON[k] * 100) + ")";
}
}
clearInterval(timer);
console.log("time: " + (new Date() - t1));
callback && callback();
}
},interval);
}
function fetchComputedStyle(obj,property){
if(window.getComputedStyle){
property = property.replace(/[A-Z]/g,function(word){
return "-" + word.toLowerCase();
});
return window.getComputedStyle(obj)[property];
}else{
property = property.replace(/-([a-z])/g,function(match,$1){
return $1.toUpperCase();
});
return obj.currentStyle[property];
}
}

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