function easeFn(t, b, c, d) {
        // t: current time, b: begInnIng value, c: change In value, d: duration
        return (t === d) ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;
    }
Enter PassThrough mode.

@param {number} [timeout] how many milliseconds to linger in PassThrough mode, to ignore it will stay in PassThrough mode until an Escape key is pressed.
@name Normal.passThrough