（1）求一个6*6阶矩阵对角线元素之和。（2）实现打印数出有10个元素的浮点数组a中的最大值和最小值。（3）求面积。（4）产生两个小按钮。（5）程序的作用是用Math.random() 函数产生20个随机数。-(1) for a 6* 6 bands and the matrix of diagonal elements. (2) to achieve print a few out there are 10 elements in a floating-point group of maximum and minimum values. (3) for the area. (4) are two small buttons. (5) the role of procedures is Math.random () functions to generate random numbers 20.