JavaScript补间动画引擎 -Tween.JS

github地址：TweenJs

var box = document.createElement('div');
box.style.setProperty('background-color', '#008800');
box.style.setProperty('width', '100px');
box.style.setProperty('height', '100px');
document.body.appendChild(box);

// Setup the animation loop.
function animate(time) {
    requestAnimationFrame(animate);
    TWEEN.update(time);
}
requestAnimationFrame(animate);

var coords = { x: 0, y: 0 }; // Start at (0, 0)
var tween = new TWEEN.Tween(coords) // Create a new tween that modifies 'coords'.
        .to({ x: 300, y: 200 }, 1000) // Move to (300, 200) in 1 second.
        .easing(TWEEN.Easing.Quadratic.Out) // Use an easing function to make the animation smooth.
        .onUpdate(function() { // Called after tween.js updates 'coords'.
            // Move 'box' to the position described by 'coords' with a CSS translation.
            box.style.setProperty('transform', 'translate(' + coords.x + 'px, ' + coords.y + 'px)');
        })
        .start(); // Start the tween immediately.