本篇目录：
1.截取指定字节数的字符串
2.判断是否微信
3.获取时间格式的几个举例
4.获取字符串字节长度
5.对象克隆、深拷贝
6.组织结构代码证验证
7.身份证号验证
8.js正则为url添加http标识
9.url有效性校验方法
10.自定义jsonp方法
11.cookie操作
12.生成随机字符串 (可指定长度)
13.浏览器判断
14.rem移动端适配
15.获取url后参数
16.动态加载js
17.生成随机颜色值
上述方法都是日常工作中使用所得，所以会不定时更新，大家也可以留下你觉得好的方法:)
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 (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.");}
测试用例：
var origin = { a: "text", b: null, c: undefined, e: { f: [1, 2] }}
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_!~*'().;?:@&=+$,%<span class="hljs-comment">#-]+)+/?)$"; 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]*))?)$/g);}
10.自定义jsonp方法/** * 自定义封装jsonp方法 * @param options */jsonp = function(options) { options = options || {}; if (!options.url || !options.callback) { throw new error("参数不合法"); } //创建 script 标签并加入到页面中 var callbackname = ('jsonp_' + math.random()).replace(".", ""); var ohead = document.getelementsbytagname('head')[0]; options.data[options.callback] = callbackname; var params = formatparams(options.data); var os = document.createelement('script'); ohead.appendchild(os); //创建jsonp回调函数 window[callbackname] = function(json) { ohead.removechild(os); cleartimeout(os.timer); window[callbackname] = null; options.success && options.success(json); }; //发送请求 os.src = options.url + '?' + params; //超时处理 if (options.time) { os.timer = settimeout(function() { window[callbackname] = null; ohead.removechild(os); options.fail && options.fail({ message: "超时" }); }, time); }};/** * 格式化参数 * @param data * @returns {string} */formatparams = function(data) { var arr = []; for (var name in data) { arr.push(encodeuricomponent(name) + '=' + encodeuricomponent(data[name])); } return arr.join('&');}
11.cookie操作//写cookiessetcookie = function(name, value, time) { var strsec = getsec(time); var exp = new date(); exp.settime(exp.gettime() + strsec * 1); document.cookie = name + "=" + escape(value) + ";expires=" + exp.togmtstring();}//cookie操作辅助函数getsec = function(str) { var str1 = str.substring(1, str.length) * 1; var str2 = str.substring(0, 1); if (str2 == "s") { return str1 * 1000; } else if (str2 == "h") { return str1 * 60 * 60 * 1000; } else if (str2 == "d") { return str1 * 24 * 60 * 60 * 1000; }}//读取cookiesgetcookie = function(name) { var arr, reg = new regexp("(^| )" + name + "=([^;]*)(;|$)"); if (arr = document.cookie.match(reg)) return (arr[2]); else return null;}//删除cookiesdelcookie = 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jsfunction 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.onload = 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('')}
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