代码片段： this.update = function () { var lastPoint = { x: _this.x, y: _this.y }; // Move points over time _this.radians = _this.velocity; // Drag effect _this.lastMouse.x = (mouse.x - _this.lastMouse.x) * 0.05; _this.lastMouse.y = (mouse.y - _this.lastMouse.y) * 0.05; // Circular Mo