Switch between animations with blending:

    // Later, switch animations with blending
    document.getElementById("walk").addEventListener("click", () => {
        idleAnim.stop();
        walkAnim.play(true);
        walkAnim.speedRatio = 1.0;
    });
    
    document.getElementById("run").addEventListener("click", () => {
        walkAnim.stop();
        runAnim.play(true);
        runAnim.speedRatio = 1.5;
    });