编程第一题: function test (str) { var arr = str.split(''); var numArr = [], alpArr = []; arr.forEach(function (item) { if ((/[0-9]/.test(item)) && (numArr.indexOf(item) === -1)) { numArr.push(item); } else if (/[a-zA-Z]/.test(item)) { alpArr.push(item); } });...