原理就是向一个定积分规定的区域内随机投入无数点，统计投入在函数曲线与坐标轴之间的点数比总点数乘此块区域面积就是积分-Principle is the random input to the area within a definite integral requirement many points, statistical input in the function of the number of points between the curve and axis than the tota