数字操作
（1）生成指定范围随机数
export const randomNum = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min;
（2）数字千分位分隔
export const format = (n) => { let num = n.toString(); let len = num.length; if (len <= 3) { return num; } else { let temp = ''; let remainder = len % 3; if (remainder > 0) { // 不是3的整数倍 return num.slice(0, remainder) + ',' + num.slice(remainder, len).match(/\d{3}/g).join(',') + temp; } else { // 3的整数倍 return num.slice(0, len).match(/\d{3}/g).join(',') + temp; } } }
数组操作
（1）数组乱序
export const arrScrambling = (arr) => { for (let i = 0; i < arr.length; i++) { const randomIndex = Math.round(Math.random() * (arr.length - 1 - i)) + i; [arr[i], arr[randomIndex]] = [arr[randomIndex], arr[i]]; } return arr; }
（2）数组扁平化
export const flatten = (arr) => { let result = []; for(let i = 0; i < arr.length; i++) { if(Array.isArray(arr[i])) { result = result.concat(flatten(arr[i])); } else { result.push(arr[i]); } } return result; }
（3）数组中获取随机数
export const sample = arr => arr[Math.floor(Math.random() * arr.length)];
字符串操作
（1）生成随机字符串
export const randomString = (len) => { let chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz123456789'; let strLen = chars.length; let randomStr = ''; for (let i = 0; i < len; i++) { randomStr += chars.charAt(Math.floor(Math.random() * strLen)); } return randomStr; };
（2）字符串首字母大写
export const fistLetterUpper = (str) => { return str.charAt(0).toUpperCase() + str.slice(1); };
（3）手机号中间四位变成*
export const telFormat = (tel) => { tel = String(tel); return tel.substr(0,3) + "****" + tel.substr(7); };
（4）驼峰命名转换成短横线命名
export const getKebabCase = (str) => { return str.replace(/[A-Z]/g, (item) => '-' + item.toLowerCase()) }
（5）短横线命名转换成驼峰命名
export const getCamelCase = (str) => { return str.replace( /-([a-z])/g, (i, item) => item.toUpperCase()) }
（6）全角转换为半角
export const toCDB = (str) => { let result = ""; for (let i = 0; i < str.length; i++) { code = str.charCodeAt(i); if (code >= 65281 && code <= 65374) { result += String.fromCharCode(str.charCodeAt(i) - 65248); } else if (code == 12288) { result += String.fromCharCode(str.charCodeAt(i) - 12288 + 32); } else { result += str.charAt(i); } } return result; }
（7）半角转换为全角
export const toDBC = (str) => { let result = ""; for (let i = 0; i < str.length; i++) { code = str.charCodeAt(i); if (code >= 33 && code <= 126) { result += String.fromCharCode(str.charCodeAt(i) + 65248); } else if (code == 32) { result += String.fromCharCode(str.charCodeAt(i) + 12288 - 32); } else { result += str.charAt(i); } } return result; }
格式转化
（1）数字转化为大写金额
export const digitUppercase = (n) => { const fraction = ['角', '分']; const digit = [ '零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖' ]; const unit = [ ['元', '万', '亿'], ['', '拾', '佰', '仟'] ]; n = Math.abs(n); let s = ''; for (let i = 0; i < fraction.length; i++) { s += (digit[Math.floor(n * 10 * Math.pow(10, i)) % 10] + fraction[i]).replace(/零./, ''); } s = s || '整'; n = Math.floor(n); for (let i = 0; i < unit[0].length && n > 0; i++) { let p = ''; for (let j = 0; j < unit[1].length && n > 0; j++) { p = digit[n % 10] + unit[1][j] + p; n = Math.floor(n / 10); } s = p.replace(/(零.)*零$/, '').replace(/^$/, '零') + unit[0][i] + s; } return s.replace(/(零.)*零元/, '元') .replace(/(零.)+/g, '零') .replace(/^整$/, '零元整'); };
（2）数字转化为中文数字
export const intToChinese = (value) => { const str = String(value); const len = str.length-1; const idxs = ['','十','百','千','万','十','百','千','亿','十','百','千','万','十','百','千','亿']; const num = ['零','一','二','三','四','五','六','七','八','九']; return str.replace(/([1-9]|0+)/g, ( $, $1, idx, full) => { let pos = 0; if($1[0] !== '0'){ pos = len-idx; if(idx == 0 && $1[0] == 1 && idxs[len-idx] == '十'){ return idxs[len-idx]; } return num[$1[0]] + idxs[len-idx]; } else { let left = len - idx; let right = len - idx + $1.length; if(Math.floor(right / 4) - Math.floor(left / 4) > 0){ pos = left - left % 4; } if( pos ){ return idxs[pos] + num[$1[0]]; } else if( idx + $1.length >= len ){ return ''; }else { return num[$1[0]] } } }); }
操作存储
（1）存储loalStorage
export const loalStorageSet = (key, value) => { if (!key) return; if (typeof value !== 'string') { value = JSON.stringify(value); } window.localStorage.setItem(key, value); };
（2）获取localStorage
export const loalStorageGet = (key) => { if (!key) return; return window.localStorage.getItem(key); };
（3）删除localStorage
export const loalStorageRemove = (key) => { if (!key) return; window.localStorage.removeItem(key); };
（4）存储sessionStorage
export const sessionStorageSet = (key, value) => { if (!key) return; if (typeof value !== 'string') { value = JSON.stringify(value); } window.sessionStorage.setItem(key, value) };
（5）获取sessionStorage
export const sessionStorageGet = (key) => { if (!key) return; return window.sessionStorage.getItem(key) };
（6）删除sessionStorage
export const sessionStorageRemove = (key) => { if (!key) return; window.sessionStorage.removeItem(key) };
