canvas - 基礎知識 - 儀表盤的繪製

js邏輯代碼： var canvas = document.getElementById('canvas'), context = canvas.getContext('2d'), CENTROID_RADIUS = 10, // 中心半徑 CENTROID_STROKE_STYLE = 'rgba(0, 0, 0, 0.5)', CENTROID_FILL_ST

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