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54. tempContext.fillRect(x, y, 80, 40); 55. e.preventDefault(); 56. }

57. if(keyID === 40 || keyID === 83) { // down arrow and S 58. clearCanvas(); 59. y = y + 10;

60. tempContext.fillRect(x, y, 80, 40); 61. e.preventDefault(); 62. }

63. if(keyID === 37 || keyID === 65) { // left arrow and A 64. clearCanvas(); 65. x = x - 10;

66. tempContext.fillRect(x, y, 80, 40); 67. e.preventDefault(); 68. } 69. } 70.

71. function clearCanvas() {

72. tempContext.clearRect(0, 0, 500, 500) 73. } 74.

75. function doMouseDown(event) { 76. var x = event.pageX; 77. var y = event.pageY;

78. var canvas = event.target;

79. var loc = getPointOnCanvas(canvas, x, y);

80. console.log(\ + loc.x + \ + loc.y + \); 81. tempContext.beginPath();

82. tempContext.moveTo(loc.x, loc.y); 83. started = true; 84. } 85.

86. function doMouseMove(event) { 87. var x = event.pageX; 88. var y = event.pageY;

89. var canvas = event.target;

90. var loc = getPointOnCanvas(canvas, x, y); 91. if (started) {

92. tempContext.lineTo(loc.x, loc.y); 93. tempContext.stroke(); 94. } 95. } 96.

97. function doMouseUp(event) {

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98. console.log(\); 99. if (started) {

100. doMouseMove(event); 101. started = false; 102. } 103. }

HTML部分：

[html] view plain copy

1. 2. 3. 4. 5. 6. 7.

HTML Canvas Event Demo - By Gloomy Fish

Press W, A, S, D keys to move

觉得不错请支持一些，谢谢！！