js常用功能集合

js常用功能集合

1.验证邮箱

function isEmail (number){
    return /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+((.[a-zA-Z0-9_-]{2,3}){1,2})$/.test(number);
}

2.验证手机号码

function isMobile (number) {
    return /^1[0-9]{10}$/.test(number)
}

3.验证是否url地址

function isURL(number){
	return /^http[s]?:\/\/.*/.test(number)
}

4.验证是否字符串

function isString (s){
    return Object.prototype.toString.call(s).slice(8, -1) === 'String'
}

5.验证是否数字

function isNumber  (s){
    return Object.prototype.toString.call(s).slice(8, -1) === 'Number'
}

6.验证是否bool

function isBoolean (s){
    return Object.prototype.toString.call(s).slice(8, -1) === 'Boolean'
}

7.验证是否函数

function isFunction (s){
    return Object.prototype.toString.call(s).slice(8, -1) === 'Function'
}

8.验证是否对象

function isObject (s){
    return Object.prototype.toString.call(s).slice(8, -1) === 'Object'
}

9.验证是否数组

function isArray (s){
    return Object.prototype.toString.call(s).slice(8, -1) === 'Array'
}

10.验证是否正则

function isRegExp(s){
    return Object.prototype.toString.call(s).slice(8, -1) === 'RegExp'
}

11.验证是否错误对象

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function isError (s){
    return Object.prototype.toString.call(s).slice(8, -1) === 'Error'
}

12.验证是否微信浏览器

function isWeiXin (){
    return ua.match(/microMessenger/i) == 'micromessenger'
}

13.验证是否移动端

function isDeviceMobile (){
    return /android|webos|iphone|ipod|balckberry/i.test(ua)
}

14.验证是否QQ浏览器

function isQQBrowser (){
    return !!ua.match(/mqqbrowser|qzone|qqbrowser|qbwebviewtype/i)
}

15.验证是否iOS

function isIos (){
    var u = navigator.userAgent;
    if (u.indexOf('Android') > -1 || u.indexOf('Linux') > -1) {  //安卓手机
        return false
    } else if (u.indexOf('iPhone') > -1) {//苹果手机
        return true
    } else if (u.indexOf('iPad') > -1) {//iPad
        return false
    } else if (u.indexOf('Windows Phone') > -1) {//winphone手机
        return false
    } else {
        return false
    }
}

16.验证是否PC端

function isPC (){
    var userAgentInfo = navigator.userAgent;
    var Agents = ["Android", "iPhone",
        "SymbianOS", "Windows Phone",
        "iPad", "iPod"];
    var flag = true;
    for (var v = 0; v < Agents.length; v++) {
        if (userAgentInfo.indexOf(Agents[v]) > 0) {
            flag = false;
            break;
        }
    }
    return flag;
}

17.去除HTML标签

function removeHtmltag (str){
    return str.replace(/<[^>]+>/g, '')
}

18.获取url参数

function getQueryString  (str){
    const reg = new RegExp('(^|&)' + str + '=([^&]*)(&|$)', 'i');
    const search = window.location.search.split('?')[1] || '';
    const r = search.match(reg) || [];
    return r[2];
}

19.根据url地址下载

function download (url){
    var isChrome = navigator.userAgent.toLowerCase().indexOf('chrome') > -1;
    var isSafari = navigator.userAgent.toLowerCase().indexOf('safari') > -1;
    if (isChrome || isSafari) {
        var link = document.createElement('a');
        link.href = url;
        if (link.download !== undefined) {
            var fileName = url.substring(url.lastIndexOf('/') + 1, url.length);
            link.download = fileName;
        }
        if (document.createEvent) {
            var e = document.createEvent('MouseEvents');
            e.initEvent('click', true, true);
            link.dispatchEvent(e);
            return true;
        }
    }
    if (url.indexOf('?') === -1) {
        url += '?download';
    }
    window.open(url, '_self');
    return true;
}

20.动态引入js

function injectScript (src){
    const s = document.createElement('script');
    s.type = 'text/javascript';
    s.async = true;
    s.src = src;
    const t = document.getElementsByTagName('script')[0];
    t.parentNode.insertBefore(s, t);
}

21.是否包含某个class

function hasClass (el, className){
    let reg = new RegExp('(^|\\s)' + className + '(\\s|$)')
    return reg.test(el.className)
}

22.el添加某个class

function addClass (el, className){
    if (hasClass(el, className)) {
        return
    }
    let newClass = el.className.split(' ')
    newClass.push(className)
    el.className = newClass.join(' ')
}

23.el去除某个class

function removeClass(el, className){
    if (!hasClass(el, className)) {
        return
    }
    let reg = new RegExp('(^|\\s)' + className + '(\\s|$)', 'g')
    el.className = el.className.replace(reg, ' ')
}

24.滚动到顶部

function scrollToTop (){
    const c = document.documentElement.scrollTop || document.body.scrollTop;
    if (c > 0) {
        window.requestAnimationFrame(scrollToTop);
        window.scrollTo(0, c - c / 8);
    }
}

25.判断一个元素是否在数组中

function contains (arr, val){
    return arr.indexOf(val) != -1 ? true : false;
}

26.去重

function unique (arr){
    if(!Array.isArray(arr)){
		return;
	}
	return Array.form(new Set(arr))
}

27.删除其中一个元素

function remove (arr, ele){
    var index = arr.indexOf(ele);
    if (index > -1) {
        arr.splice(index, 1);
    }
    return arr;
}

28.最大值

function max (arr){
    return Math.max.apply(null, arr);
}

29.最小值

function min (arr){
    return Math.min.apply(null, arr);
}

30.去除空格,type: 1-所有空格 2-前后空格 3-前空格 4-后空格

function trim (str, type){
    type = type || 1
    switch (type) {
        case 1:
            return str.replace(/\s+/g, "");
        case 2:
            return str.replace(/(^\s*)|(\s*$)/g, "");
        case 3:
            return str.replace(/(^\s*)/g, "");
        case 4:
            return str.replace(/(\s*$)/g, "");
        default:
            return str;
    }
}

31.字符转换，type: 1:首字母大写 2：首字母小写 3：大小写转换 4：全部大写 5：全部小写

function changeCase (str, type){
    type = type || 4
    switch (type) {
        case 1:
            return str.replace(/\b\w+\b/g, function (word) {
                return word.substring(0, 1).toUpperCase() + word.substring(1).toLowerCase();

            });
        case 2:
            return str.replace(/\b\w+\b/g, function (word) {
                return word.substring(0, 1).toLowerCase() + word.substring(1).toUpperCase();
            });
        case 3:
            return str.split('').map(function (word) {
                if (/[a-z]/.test(word)) {
                    return word.toUpperCase();
                } else {
                    return word.toLowerCase()
                }
            }).join('')
        case 4:
            return str.toUpperCase();
        case 5:
            return str.toLowerCase();
        default:
            return str;
    }
}

32.检验密码强度

function checkPwd (str){
    var Lv = 0;
    if (str.length < 6) {
        return Lv
    }
    if (/[0-9]/.test(str)) {
        Lv++
    }
    if (/[a-z]/.test(str)) {
        Lv++
    }
    if (/[A-Z]/.test(str)) {
        Lv++
    }
    if (/[\.|-|_]/.test(str)) {
        Lv++
    }
    return Lv;
}

33.在字符串中插入新字符串

function insertStr (soure, index, newStr){
    var str = soure.slice(0, index) + newStr + soure.slice(index);
    return str;
}

34.追加url参数

function appendQuery (url, key, value){
    var options = key;
    if (typeof options == 'string') {
        options = {};
        options[key] = value;
    }
    options = $.param(options);
    if (url.includes('?')) {
        url += '&' + options
    } else {
        url += '?' + options
    }
    return url;
}