Summary of the key points of native js movement methods

Main method: Use of timer setInterval(function(){},30);

In order to avoid errors when the speed is about to stop at the last moment, you can use the following method:

if（iSpeed<1）//速度足够小的时候，让速度直接为0，避免速度的波动{
iSpeed = 0;
}

Use of absolute values ​​(mainly used in elastic motion and other situations where the speed is positive and negative):

Math.abs(2.5)// 2

Combination of elastic motion and friction:

iSpeed+=(iTarget-obj.offsetLeft)/5;
iSpeed*=0.7;

Simulated friction:

iSpeed*=0.95;//小数速度会越来越小

Deceleration motion:

iSpeed--;

Acceleration motion:

iSpeed++;

Elastic motion:

iSpeed+=(300-op.offsetLeft)/50;

Collision motion:

iSpeed *= -1;

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