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资源说明：stab at a js countdown 'meter'
circle-timer js class and some css to make a css transition-based countdown timer in which a circle is 'eaten away.' high-level: - imagine four circles on top of another - each is transparent except for a 90 degree wedge which is opaque - the opaque wedge of each circle is in a different quadrant - moving up from the bottom of the stack of circles they are in quadrants I, IV, III, and II - the circle appears entirely filled at the start - countdown begins and the circle in quadrant II spins counter clockwise 90 degrees, revealing the background - when its opaque quarter is in quadrant III, the next wedge begins rotating in the same direction - this first circle is removed - this pattern of spinning a quadrant underneath the next quadrant repeats twice - quadrant III will spin underneath quadrant IV - quadrant IV will then rotate beneath quadrant I - the final quarter of a circle is handled differently -- a fifth circle rotates on top of it - this fifth circle has an opaque quarter that is the same color as the background - this circle is waiting in quadrant IV and rotates counterclockwise to cover the final segment would-be-nice: - fix the thin quarter-ring left visible in the quadrant I circle as the final circle rotates over top - perhaps make the final circle somewhat larger - better demo with interactive input - better positioning of the timer -- guarantee centering within the container div
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