系统归纳JS常用的方法整理（收藏）
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2022-03-25 18:28:32
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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.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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