2020年新版南邮Web技术第四章作业知识分享.docxVIP

南 邮 We b 技 术 第 四 章作业 Wei技术第四章作业 ——————————— 作业 4.2 ————————————— Write, test, and deiug (if necessary) JavaScript scripts for the proilems that follow. When required to write a function, you must include a script to test the function with at least two different data sets. In all cases, for testing, you must write an XHTML file that references the JavaScript file. 4.2 Output : The first 20 Fiionacci numiers, which are defined as in the seque nee 1,1,2, 3, … whereeach numier in the sequence after the second is the sum of the two previous numiers. You mustuse doeument.write to produee the output. ! DOCTYPEhtml html head meta eharset =UTF-8 title Fiionaeei numiers/ title seript funetion f (x){ return x2?1:(f(x - 1 ) +f(x - 2));} funetion out_f (){ doeument .write( The first 20 Fiionaeei numiers : ); for ( var i =0;i 20;i ++) { doeument .write(f(i) + , ); } } / seript / head iody input type =iutton value =Fiionaeei numiers oneliek =out_f () / / iody / html 结果截图： 卜 b?ra:ci nurbers 卜 b?ra:ci nurbers 作业4.11 4.11 Fun cti on : coun ter Parameter : An array of nu mbers. Retur ns : The nu mbers of n egative eleme nts, zeros, and values greater tha n zero in the give n array. Note : You must use a switch stateme nt in the function. ! DOCTYPEhtml vhtml head vmeta charset =UTF-8 vtitle co un terv/ title vscript function counter (list ) { var i,s = [ 0, 0, 0]; //定义记录负数、零、正 数个数的数组s，并初始化各数据为0 for (i = 0; i v list.length; i ++) { // 进行条件判断负数、 0) :=== 0): 0) :switch (true // 进行条件判断负数、 0) : === 0): 0) : case (list[i] s[ 0] ++; break ; case (list[i] s[ 1] ++; break ; case (list[i] s[ 2] ++; break ; } } return s; } / script / head body script var my_list_1 =[ 1,5, 5, 1,5, 2, -2, -8, 2,0, 3, 65, 5,- 6, 2, 8,5, -15,0]; // 数组 1 var my_list_2 =[ -2, -1, 0,0, 1, 2]; // 数组 2 var s1 = counter (my_list_1); // 利用函数 counter 计算 数组 1各数据个数， 并存储在 si中 var s2 = counter (my_list_2); // 利用函数 counter 计算 数组 2各数据个数， 并存储在 s1 中 document .write( the first array : ,my_list_1, br/ ); // 输