目录：
截取指定字节数的字符串
判断是否微信
获取时间格式的几个举例
获取字符串字节长度
对象克隆、深拷贝
组织结构代码证验证
身份证号验证
js正则为url添加http标识
URL有效性校验方法
自定义jsonp方法
cookie操作
生成随机字符串 (可指定长度)
浏览器判断
Rem移动端适配
获取url后参数
动态加载JS
生成随机颜色值
1.截取指定字节数的字符串
/** * 截取指定字节的字符串 * @param str 要截取的字符穿 * @param len 要截取的长度，根据字节计算 * @param suffix 截取前len个后，其余的字符的替换字符，一般用“…” * @returns {*} */ function cutString(str, len, suffix) { if (!str) return ""; if (len <= 0) return ""; if (!suffix) suffix = ""; var templen = 0; for (var i = 0; i < str.length; i++) { if (str.charCodeAt(i) > 255) { templen += 2; } else { templen++ } if (templen == len) { return str.substring(0, i + 1) + suffix; } else if (templen > len) { return str.substring(0, i) + suffix; } } return str; }2.判断是否微信
/** * 判断微信浏览器 * @returns {Boolean} */ function isWeiXin() { var ua = window.navigator.userAgent.toLowerCase(); if (ua.match(/MicroMessenger/i) == 'micromessenger') { return true; } else { return false; } }3.获取时间格式的几个举例
function getTimeFormat(time) { var date = new Date(parseInt(time) * 1000); var month, day, hour, min; parseInt(date.getMonth()) + 1 < 10 ? month = '0' + (parseInt(date.getMonth()) + 1) : month = parseInt(date.getMonth()) + 1; date.getDate() < 10 ? day = '0' + date.getDate() : day = date.getDate(); date.getHours() < 10 ? hour = '0' + date.getHours() : hour = date.getHours(); date.getMinutes() < 10 ? min = '0' + date.getMinutes() : min = date.getMinutes(); return [month, day].join('-') + ' ' + hour + ':' + min } function getTimeFormatYMD(time) { var date = new Date(parseInt(time) * 1000); var year, month, day; year = date.getFullYear(); parseInt(date.getMonth()) + 1 < 10 ? month = '0' + (parseInt(date.getMonth()) + 1) : month = parseInt(date.getMonth()) + 1; date.getDate() < 10 ? day = '0' + date.getDate() : day = date.getDate(); return [year, month, day].join('-') } function getTimeFormatAll(time) { var date = new Date(parseInt(time) * 1000); var year, month, day, hour, min, second; year = date.getFullYear(); parseInt(date.getMonth()) + 1 < 10 ? month = '0' + (parseInt(date.getMonth()) + 1) : month = parseInt(date.getMonth()) + 1; date.getDate() < 10 ? day = '0' + date.getDate() : day = date.getDate(); date.getHours() < 10 ? hour = '0' + date.getHours() : hour = date.getHours(); date.getMinutes() < 10 ? min = '0' + date.getMinutes() : min = date.getMinutes(); date.getSeconds() < 10 ? second = '0' + date.getSeconds() : second = date.getSeconds(); return [year, month, day].join('-') + ' ' + hour + ':' + min + ':' + second }4.获取字符串字节长度
/** * 获取字符串字节长度 * @param {String} * @returns {Boolean} */ function checkLength(v) { var realLength = 0; var len = v.length; for (var i = 0; i < len; i++) { var charCode = v.charCodeAt(i); if (charCode >= 0 && charCode <= 128) realLength += 1; else realLength += 2; } return realLength; }5.对象克隆、深拷贝
/** * 对象克隆&深拷贝 * @param obj * @returns {{}} */ function cloneObj(obj) { var newO = {}; if (obj instanceof Array) { newO = []; } for (var key in obj) { var val = obj[key]; newO[key] = typeof val === 'object' ? arguments.callee(val) : val; } return newO; };克隆拷贝增强版
/** * 对象克隆&深拷贝 * @param obj * @returns {{}} */ function clone(obj) { // Handle the 3 simple types, and null or undefined if (null == obj || "object" != typeof obj) return obj; // Handle Date if (obj instanceof Date) { var copy = new Date(); copy.setTime(obj.getTime()); return copy; } // Handle Array if (obj instanceof Array) { var copy = []; for (var i = 0, len = obj.length; i < len; ++i) { copy[i] = clone(obj[i]); } return copy; } // Handle Object if (obj instanceof Object) { var copy = {}; for (var attr in obj) { if (obj.hasOwnProperty(attr)) copy[attr] = clone(obj[attr]); } return copy; } throw new Error("Unable to copy obj! Its type isn't supported."); }6.组织结构代码证验证
验证规则：
组织机构代码是每一个机关、社会团体、企事业单位在全国范围内唯一的、始终不变的法定代码标识。最新使用的组织机构代码在1997年颁布实施，由8位数字（或大写拉丁字母）本体代码和1位数字（或大写拉丁字母）校验码组成。本体代码采用系列（即分区段）顺序编码方法。校验码按下列公式计算：8 C9 = 11 - MOD(∑Ci * Wi，11)… (2) i = 1其中：MOD——表示求余函数；i——表示代码字符从左到右位置序号；Ci——表示第i位置上的代码字符的值，采用附录A“代码字符集”所列字符；C9——表示校验码；Wi——表示第i位置上的加权因子，其数值如下表：i 1 2 3 4 5 6 7 8 Wi 3 7 9 10 5 8 4 2当MOD函数值为1（即C9 = 10）时，校验码用字母X表示。
验证方法：
checkOrgCodeValid: function(el) { var txtval = el.value; var values = txtval.split("-"); var ws = [3, 7, 9, 10, 5, 8, 4, 2]; var str = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'; var reg = /^([0-9A-Z]){8}$/; if (!reg.test(values[0])) { return false } var sum = 0; for (var i = 0; i < 8; i++) { sum += str.indexOf(values[0].charAt(i)) * ws[i]; } var C9 = 11 - (sum % 11); var YC9 = values[1] + ''; if (C9 == 11) { C9 = '0'; } else if (C9 == 10) { C9 = 'X'; } else { C9 = C9 + ''; } return YC9 == C9; }7.身份证号验证
/** * 验证身份证号 * @param el 号码输入input * @returns {boolean} */ function checkCardNo(el) { var txtval = el.value; var reg = /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/; return reg.test(txtval) }8.js正则为url添加http标识
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="renderer" content="webkit"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <title></title> <script> var html = 'http:/ / www.google.com '; html += '\rwww.google.com '; html += '\rcode.google.com '; html += '\rhttp: //code.google.com/hosting/search?q=label%3aPython'; var regex = /(https?:\/\/)?(\w+\.?)+(\/[a-zA-Z0-9\?%=_\-\+\/]+)?/gi; alert('before replace:'); alert(html); html = html.replace(regex, function(match, capture) { if (capture) { return match } else { return 'http://' + match; } }); alert('after replace:'); alert(html); </script> </head> <body> </body> </html>9.URL有效性校验方法
/** * URL有效性校验 * @param str_url * @returns {boolean} */ function isURL(str_url) { // 验证url var strRegex = "^((https|http|ftp|rtsp|mms)?://)" + "?(([0-9a-z_!~*'().&=+$%-]+: )?[0-9a-z_!~*'().&=+$%-]+@)?" // ftp的user@ + "(([0-9]{1,3}\.){3}[0-9]{1,3}" // IP形式的URL- 199.194.52.184 + "|" // 允许IP和DOMAIN（域名） + "([0-9a-z_!~*'()-]+\.)*" // 域名- www. + "([0-9a-z][0-9a-z-]{0,61})?[0-9a-z]\." // 二级域名 + "[a-z]{2,6})" // first level domain- .com or .museum + "(:[0-9]{1,4})?" // 端口- :80 + "((/?)|" // a slash isn't required if there is no file name + "(/[0-9a-z_!~*'().;?:@&=+$,%#-]+)+/?)$"; var re = new RegExp(strRegex); return re.test(str_url); } // 建议的正则 functionisURL(str) { return !! str.match(/(((^https?:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Za-z0-9.-]+|(?:www.|[-;:&=\+\$,\w]+@)[A-Za-z0-9.-]+)((?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[\w]*))?)$/g); }10.自定义jsonp方法
/** * 自定义封装jsonp方法 * @param options */ jsonp = function(options) { options = options || {}; if (!options.url || !options.callback) { throw new Error("参数不合法"); } //创建 script 标签并加入到页面中 var callbackName = ('jsonp_' + Math.random()).replace(".", ""); var oHead = document.getElementsByTagName('head')[0]; options.data[options.callback] = callbackName; var params = formatParams(options.data); var oS = document.createElement('script'); oHead.appendChild(oS); //创建jsonp回调函数 window[callbackName] = function(json) { oHead.removeChild(oS); clearTimeout(oS.timer); window[callbackName] = null; options.success && options.success(json); }; //发送请求 oS.src = options.url + '?' + params; //超时处理 if (options.time) { oS.timer = setTimeout(function() { window[callbackName] = null; oHead.removeChild(oS); options.fail && options.fail({ message: "超时" }); }, time); } }; /** * 格式化参数 * @param data * @returns {string} */ formatParams = function(data) { var arr = []; for (var name in data) { arr.push(encodeURIComponent(name) + '=' + encodeURIComponent(data[name])); } return arr.join('&'); }11.cookie操作
//写cookies setCookie = function(name, value, time) { var strsec = getsec(time); var exp = new Date(); exp.setTime(exp.getTime() + strsec * 1); document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString(); } //cookie操作辅助函数 getsec = function(str) { var str1 = str.substring(1, str.length) * 1; var str2 = str.substring(0, 1); if (str2 == "s") { return str1 * 1000; } else if (str2 == "h") { return str1 * 60 * 60 * 1000; } else if (str2 == "d") { return str1 * 24 * 60 * 60 * 1000; } } //读取cookies getCookie = function(name) { var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)"); if (arr = document.cookie.match(reg)) return (arr[2]); else return null; } //删除cookies delCookie = function(name) { var exp = new Date(); exp.setTime(exp.getTime() - 1); var cval = getCookie(name); if (cval != null) document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString(); }12.生成随机字符串 (可指定长度)
/** * 生成随机字符串(可指定长度) * @param len * @returns {string} */ randomString = function(len) { len = len || 8; var $chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'; /****默认去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1****/ var maxPos = $chars.length; var pwd = ''; for (var i = 0; i < len; i++) { pwd += $chars.charAt(Math.floor(Math.random() * maxPos)); } return pwd; }13.浏览器判断
function parseUA() { var u = navigator.userAgent; var u2 = navigator.userAgent.toLowerCase(); return { //移动终端浏览器版本信息 trident: u.indexOf('Trident') > -1, //IE内核 presto: u.indexOf('Presto') > -1, //opera内核 webKit: u.indexOf('AppleWebKit') > -1, //苹果、谷歌内核 gecko: u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1, //火狐内核 mobile: !!u.match(/AppleWebKit.*Mobile.*/), //是否为移动终端 ios: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), //ios终端 android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1, //android终端或uc浏览器 iPhone: u.indexOf('iPhone') > -1, //是否为iPhone或者QQHD浏览器 iPad: u.indexOf('iPad') > -1, //是否iPad webApp: u.indexOf('Safari') == -1, //是否web应该程序，没有头部与底部 iosv: u.substr(u.indexOf('iPhone OS') + 9, 3), weixin: u2.match(/MicroMessenger/i) == "micromessenger", ali: u.indexOf('AliApp') > -1, }; } var ua = parseUA(); if (!ua.mobile) { location.href = './pc.html'; }14.Rem移动端适配
var rem = { baseRem: 40, // 基准字号，按照iphone6应该为20，此处扩大2倍，便于计算 baseWidth: 750, // 基准尺寸宽，此处是按照ihpone6的尺寸 rootEle: document.getElementsByTagName("html")[0], initHandle: function() { this.setRemHandle(); this.resizeHandle(); }, setRemHandle: function() { var clientWidth = document.documentElement.clientWidth || document.body.clientWidth; this.rootEle.style.fontSize = clientWidth * this.baseRem / this.baseWidth + "px"; }, resizeHandle: function() { var that = this; window.addEventListener("resize", function() { setTimeout(function() { that.setRemHandle(); }, 300); }); } }; rem.initHandle();15.获取url后参数
function GetRequest() { var url = location.search; //获取url中"?"符后的字串 var theRequest = new Object(); if (url.indexOf("?") != -1) { var str = url.substr(1); strs = str.split("&"); for (var i = 0; i < strs.length; i++) { theRequest[strs[i].split("=")[0]] = (strs[i].split("=")[1]); } } return theRequest; }16.动态加载JS
function loadScript(url, callback) { var script = document.createElement("script"); script.type = "text/"; if (typeof(callback) != "undefined") { if (script.readyState) { script.onreadystatechange = function() { if (script.readyState == "loaded" || script.readyState == "complete") { script.onreadystatechange = null; callback(); } }; } else { script. = function() { callback(); }; } } script.src = url; document.body.appendChild(script); }17.生成随机颜色值
function getRandomColor () { const rgb = [] for (let i = 0 ; i < 3; ++i){ let color = Math.floor(Math.random() * 256).toString(16) color = color.length == 1 ? '0' + color : color rgb.push(color) } return '#' + rgb.join('') }原文：https://frontendjs.com/topic/...