bezier: function (points, times) {  // 0、以3個控制點(diǎn)為例，點(diǎn)A,B,C,AB上設(shè)置點(diǎn)D,BC上設(shè)置點(diǎn)E,DE連線上設(shè)置點(diǎn)F,則最終的貝塞爾曲線是點(diǎn)F的坐標(biāo)軌跡。  // 1、計算相鄰控制點(diǎn)間距。  // 2、根據(jù)完成時間,計算每次執(zhí)行時D在AB方向上移動的距離，E在BC方向上移動的距離。  // 3、時間每遞增100ms，則D,E在指定方向上發(fā)生位移, F在DE上的位移則可通過AD/AB = DF/DE得出。  // 4、根據(jù)DE的正余弦值和DE的值計算出F的坐標(biāo)。  // 鄰控制AB點(diǎn)間距  var bezier_points = [];  var points_D = [];  var points_E = [];  const DIST_AB = Math.sqrt(Math.pow(points[1]['x'] - points[0]['x'], 2) + Math.pow(points[1]['y'] - points[0]['y'], 2));  // 鄰控制BC點(diǎn)間距  const DIST_BC = Math.sqrt(Math.pow(points[2]['x'] - points[1]['x'], 2) + Math.pow(points[2]['y'] - points[1]['y'], 2));  // D每次在AB方向上移動的距離  const EACH_MOVE_AD = DIST_AB / times;  // E每次在BC方向上移動的距離   const EACH_MOVE_BE = DIST_BC / times;  // 點(diǎn)AB的正切  const TAN_AB = (points[1]['y'] - points[0]['y']) / (points[1]['x'] - points[0]['x']);  // 點(diǎn)BC的正切  const TAN_BC = (points[2]['y'] - points[1]['y']) / (points[2]['x'] - points[1]['x']);  // 點(diǎn)AB的弧度值  const RADIUS_AB = Math.atan(TAN_AB);  // 點(diǎn)BC的弧度值  const RADIUS_BC = Math.atan(TAN_BC);  // 每次執(zhí)行  for (var i = 1; i <= times; i++) {  // AD的距離  var dist_AD = EACH_MOVE_AD * i;  // BE的距離  var dist_BE = EACH_MOVE_BE * i;  // D點(diǎn)的坐標(biāo)  var point_D = {};  point_D['x'] = dist_AD * Math.cos(RADIUS_AB) + points[0]['x'];  point_D['y'] = dist_AD * Math.sin(RADIUS_AB) + points[0]['y'];  points_D.push(point_D);  // E點(diǎn)的坐標(biāo)  var point_E = {};  point_E['x'] = dist_BE * Math.cos(RADIUS_BC) + points[1]['x'];  point_E['y'] = dist_BE * Math.sin(RADIUS_BC) + points[1]['y'];  points_E.push(point_E);  // 此時線段DE的正切值  var tan_DE = (point_E['y'] - point_D['y']) / (point_E['x'] - point_D['x']);  // tan_DE的弧度值  var radius_DE = Math.atan(tan_DE);  // 地市DE的間距  var dist_DE = Math.sqrt(Math.pow((point_E['x'] - point_D['x']), 2) + Math.pow((point_E['y'] - point_D['y']), 2));  // 此時DF的距離  var dist_DF = (dist_AD / DIST_AB) * dist_DE;  // 此時DF點(diǎn)的坐標(biāo)  var point_F = {};  point_F['x'] = dist_DF * Math.cos(radius_DE) + point_D['x'];  point_F['y'] = dist_DF * Math.sin(radius_DE) + point_D['y'];  bezier_points.push(point_F);  }  return {  'bezier_points': bezier_points  };  }