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canvas制作天气折线图

<canvas id="myCanvas" width="440" height="60"></canvas> var sixdayHighTemperature = [5, 1, -12, -5, -10]; // 五天最高温度数组 var sixdayLowTemperature = [-5, -10, -18, -18, -20]; // 五天最低温度数组 var canvas = docu