//1.利用reduce()求积 function product(arr) { //product乘积;multiply相乘 function multiply(product, nextElement) { console.log(product + ' ' + nextElement); return product * nextElement; } var w = arr.reduce(multiply); console.log(w); return w; } //2.把字符串13579变成Array——[1, 3, 5, 7, 9],再将array转换成number整数。不使用JavaScript内置的parseInt()函数 function string2int(s) { var arr = []; //把字符串中的字符放入数组中 for(var c of s){ arr.push(c); } console.log(arr); //字符转成数值 //ASCII码,数字字符的ASCII码 - '0'的ASCII码值 = 数字字符的数值 //可以换成var brr = arr.map(Number); var brr = arr.map(function(x){ return x-'0'; }) console.log(brr); //数组转成整数 var c = brr.reduce(function(x, y) { return x * 10 + y; }); console.log(c); return c; } //3.把用户输入的不规范的英文名字,变为首字母大写,其他小写的规范名字 function normalize(arr) { var brr = arr.map(function(x){ return x[0].toUpperCase() + x.substring(1).toLowerCase(); }); return brr; }
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