Uniform motion and variable speed (buffering) movement in javascript detail _ basics

The movement of a div is actually a change in its distance from the browser's border. If the rate of change is certain, it is uniform motion; if the rate of change is not necessarily, then it is variable motion. When the rate of change is proportional to the distance from the frame of the browser, then it can be said that Div is doing the buffer movement.
In fact, very simple, is to use a timer (timer), every once in a while to change the distance of the div-Poly browser border.

such as uniform motion:

Enter timer: (Every 30ms)
if (to reach the end)
{Stop Timer}
else do{Change Distance}

The way to change the distance is to decide whether it is uniform or variable speed (buffer) movement.

uniform, such as:

Copy Code code as follows:

var timer=null;
function Startmove ()
{

var Odiv=document.getelementbyid (' Div1 ');
Clearinterval (timer);
Timer=setinterval (function () {
var ispeed=1;

if (odiv.offsetleft>=300)
{
Clearinterval (timer);
}
Else
{
odiv.style.left=odiv.offsetleft+ispeed+ ' px ';
}
},30);
};

Buffer Movement:

Copy Code code as follows:

var timer=null;
function Startmove ()
{
var itarget=300;

var Odiv=document.getelementbyid (' Div1 ');

Clearinterval (timer);
Timer=setinterval (function () {
var ispeed= (Itarget-odiv.offsetleft)/8;

Ispeed=ispeed>0? Math.ceil (ispeed): Math.floor (Ispeed);

Ispeed=math.ceil (Ispeed);
if (odiv.offsetleft==itarget)
{
Clearinterval (timer);
}
Else
{
odiv.style.left=odiv.offsetleft+ispeed+ ' px ';
}
Document.title=odiv.style.left+ ' +ispeed;
},30);
};

So, a motion frame is written! The principle is simple, but still need to be perfected. Take it slow!