效果图：
这个实例主要注意:
1，剩余时间的计算
2，每个时间数字的绘制
时间主要有0-9和一个冒号组成，用数组来表示( 0: 就是不画圆，1：就是画一个蓝色的圆 )
num.js文件：
1 var digital = 2 [ 3 [ 4 [0,0,1,1,1,0,0], 5 [0,1,1,0,1,1,0], 6 [1,1,0,0,0,1,1], 7 [1,1,0,0,0,1,1], 8 [1,1,0,0,0,1,1], 9 [1,1,0,0,0,1,1], 10 [1,1,0,0,0,1,1], 11 [1,1,0,0,0,1,1], 12 [0,1,1,0,1,1,0], 13 [0,0,1,1,1,0,0] 14 ],//0 15 [ 16 [0,0,0,1,1,0,0], 17 [0,1,1,1,1,0,0], 18 [0,0,0,1,1,0,0], 19 [0,0,0,1,1,0,0], 20 [0,0,0,1,1,0,0], 21 [0,0,0,1,1,0,0], 22 [0,0,0,1,1,0,0], 23 [0,0,0,1,1,0,0], 24 [0,0,0,1,1,0,0], 25 [1,1,1,1,1,1,1] 26 ],//1 27 [ 28 [0,1,1,1,1,1,0], 29 [1,1,0,0,0,1,1], 30 [0,0,0,0,0,1,1], 31 [0,0,0,0,1,1,0], 32 [0,0,0,1,1,0,0], 33 [0,0,1,1,0,0,0], 34 [0,1,1,0,0,0,0], 35 [1,1,0,0,0,0,0], 36 [1,1,0,0,0,1,1], 37 [1,1,1,1,1,1,1] 38 ],//2 39 [ 40 [1,1,1,1,1,1,1], 41 [0,0,0,0,0,1,1], 42 [0,0,0,0,1,1,0], 43 [0,0,0,1,1,0,0], 44 [0,0,1,1,1,0,0], 45 [0,0,0,0,1,1,0], 46 [0,0,0,0,0,1,1], 47 [0,0,0,0,0,1,1], 48 [1,1,0,0,0,1,1], 49 [0,1,1,1,1,1,0] 50 ],//3 51 [ 52 [0,0,0,0,1,1,0], 53 [0,0,0,1,1,1,0], 54 [0,0,1,1,1,1,0], 55 [0,1,1,0,1,1,0], 56 [1,1,0,0,1,1,0], 57 [1,1,1,1,1,1,1], 58 [0,0,0,0,1,1,0], 59 [0,0,0,0,1,1,0], 60 [0,0,0,0,1,1,0], 61 [0,0,0,1,1,1,1] 62 ],//4 63 [ 64 [1,1,1,1,1,1,1], 65 [1,1,0,0,0,0,0], 66 [1,1,0,0,0,0,0], 67 [1,1,1,1,1,1,0], 68 [0,0,0,0,0,1,1], 69 [0,0,0,0,0,1,1], 70 [0,0,0,0,0,1,1], 71 [0,0,0,0,0,1,1], 72 [1,1,0,0,0,1,1], 73 [0,1,1,1,1,1,0] 74 ],//5 75 [ 76 [0,0,0,0,1,1,0], 77 [0,0,1,1,0,0,0], 78 [0,1,1,0,0,0,0], 79 [1,1,0,0,0,0,0], 80 [1,1,0,1,1,1,0], 81 [1,1,0,0,0,1,1], 82 [1,1,0,0,0,1,1], 83 [1,1,0,0,0,1,1], 84 [1,1,0,0,0,1,1], 85 [0,1,1,1,1,1,0] 86 ],//6 87 [ 88 [1,1,1,1,1,1,1], 89 [1,1,0,0,0,1,1], 90 [0,0,0,0,1,1,0], 91 [0,0,0,0,1,1,0], 92 [0,0,0,1,1,0,0], 93 [0,0,0,1,1,0,0], 94 [0,0,1,1,0,0,0], 95 [0,0,1,1,0,0,0], 96 [0,0,1,1,0,0,0], 97 [0,0,1,1,0,0,0] 98 ],//7 99 [ 100 [0,1,1,1,1,1,0], 101 [1,1,0,0,0,1,1], 102 [1,1,0,0,0,1,1], 103 [1,1,0,0,0,1,1], 104 [0,1,1,1,1,1,0], 105 [1,1,0,0,0,1,1], 106 [1,1,0,0,0,1,1], 107 [1,1,0,0,0,1,1], 108 [1,1,0,0,0,1,1], 109 [0,1,1,1,1,1,0] 110 ],//8 111 [ 112 [0,1,1,1,1,1,0], 113 [1,1,0,0,0,1,1], 114 [1,1,0,0,0,1,1], 115 [1,1,0,0,0,1,1], 116 [0,1,1,1,0,1,1], 117 [0,0,0,0,0,1,1], 118 [0,0,0,0,0,1,1], 119 [0,0,0,0,1,1,0], 120 [0,0,0,1,1,0,0], 121 [0,1,1,0,0,0,0] 122 ],//9 123 [ 124 [0,0,0,0], 125 [0,0,0,0], 126 [0,1,1,0], 127 [0,1,1,0], 128 [0,0,0,0], 129 [0,0,0,0], 130 [0,1,1,0], 131 [0,1,1,0], 132 [0,0,0,0], 133 [0,0,0,0] 134 ]//: 135 ];