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公用方法总结

javascript读完大概需要31分钟

  • 发布时间:2017-12-23 15:20 星期六
  • 刘伟波
  • 243
  • 更新于2018-01-08 21:53 星期一

1 class

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

export function addClass(el, className) {
if (hasClass(el, className)) {
return
}

let newClass = el.className.split(' ')
newClass.push(className)
el.className = newClass.join(' ')
}

复制对象并添加对象

const data=Object.assign({},commonParams,{
platform:'h5',
uin:0,
needNewCode:1
})

获取或者设置属性

export function getData(el, name, val) {
const prefix = 'data-'
if (val) {
return el.setAttribute(prefix + name, val)
}
return el.getAttribute(prefix + name)
}


url拼接

export function param(data) {
let url = ''
for (var k in data) {
let value = data[k] !== undefined ? data[k] : ''
url += '&' + k + '=' + encodeURIComponent(value)
}
return url ? url.substring(1) : ''
}

better-scroll异常

在mounted的时候dom结构已经渲染完成,但是因为轮播数据为异步获取,所以

<slider v-if="recommends.length">
<div v-for="item in recommends">
<a :href="item.linkUrl">
<img :src="item.picUrl" alt="">
</a>
</div>
</slider>


获得随机数组。随机洗牌

https://stackoverflow.com/questions/2450954/how-to-randomize-shuffle-a-javascript-array

function getRandomInt(min, max) {
return Math.floor(Math.random() * (max - min + 1) + min)
}

export function shuffle(arr) { //获得随机数组元素
// _arr这里只是一个副本,包装原来的数组不发生变化
let _arr = arr.slice()
for (let i = 0; i < _arr.length; i++) {
let j = getRandomInt(0, i)
let t = _arr[i]
_arr[i] = _arr[j]
_arr[j] = t
}
return _arr //这个方法听说不完全随机
/*let _arr = arr.slice()
return _arr.sort(function () {
return 0.5-Math.random()
})*/
} // ES6允许我们指定两个变量。 这一点尤其方便当我们想交换两个变量的值,我们可以用一行代码。 这是一个短形式相同的功能,使用该功能。
function shuffle(arr) { //获得随机数组元素
// _arr这里只是一个副本,包装原来的数组不发生变化
let _arr = arr.slice()
for (let i = 0; i < _arr.length; i++) {
let j = Math.floor(Math.random() * (i + 1));
[_arr[i], _arr[j]] = [_arr[j], _arr[i]];
}
return _arr
}


1.Array

1.1 arrayEqual

/**
 * 
 * @desc 判断两个数组是否相等
 * @param {Array} arr1 
 * @param {Array} arr2 
 * @return {Boolean}
 */
function arrayEqual(arr1, arr2) {
    if (arr1 === arr2) return true;
    if (arr1.length != arr2.length) return false;
    for (var i = 0; i < arr1.length; ++i) {
        if (arr1[i] !== arr2[i]) return false;
    }
    return true;
}

2.Class

2.1 addClass

/**
 * 
 * @desc   为元素添加class
 * @param  {HTMLElement} ele 
 * @param  {String} cls 
 */

var hasClass = require('./hasClass');

function addClass(ele, cls) {
    if (!hasClass(ele, cls)) {
        ele.className += ' ' + cls;
    }
}

2.2 hasClass

/**
 * 
 * @desc 判断元素是否有某个class
 * @param {HTMLElement} ele 
 * @param {String} cls 
 * @return {Boolean}
 */
function hasClass(ele, cls) {
    return (new RegExp('(\\s|^)' + cls + '(\\s|$)')).test(ele.className);
}

2.3 removeClass

/**
 * 
 * @desc 为元素移除class
 * @param {HTMLElement} ele 
 * @param {String} cls 
 */

var hasClass = require('./hasClass');

function removeClass(ele, cls) {
    if (hasClass(ele, cls)) {
        var reg = new RegExp('(\\s|^)' + cls + '(\\s|$)');
        ele.className = ele.className.replace(reg, ' ');
    }
}

3.3 setCookie

/**
 * 
 * @desc  设置Cookie
 * @param {String} name 
 * @param {String} value 
 * @param {Number} days 
 */
function setCookie(name, value, days) {
    var date = new Date();
    date.setDate(date.getDate() + days);
    document.cookie = name + '=' + value + ';expires=' + date;
}

4.Device

4.1 getExplore

/**
 * 
 * @desc 获取浏览器类型和版本
 * @return {String} 
 */
function getExplore() {
    var sys = {},
        ua = navigator.userAgent.toLowerCase(),
        s;
    (s = ua.match(/rv:([\d.]+)\) like gecko/)) ? sys.ie = s[1]:
        (s = ua.match(/msie ([\d\.]+)/)) ? sys.ie = s[1] :
        (s = ua.match(/edge\/([\d\.]+)/)) ? sys.edge = s[1] :
        (s = ua.match(/firefox\/([\d\.]+)/)) ? sys.firefox = s[1] :
        (s = ua.match(/(?:opera|opr).([\d\.]+)/)) ? sys.opera = s[1] :
        (s = ua.match(/chrome\/([\d\.]+)/)) ? sys.chrome = s[1] :
        (s = ua.match(/version\/([\d\.]+).*safari/)) ? sys.safari = s[1] : 0;
    // 根据关系进行判断
    if (sys.ie) return ('IE: ' + sys.ie)
    if (sys.edge) return ('EDGE: ' + sys.edge)
    if (sys.firefox) return ('Firefox: ' + sys.firefox)
    if (sys.chrome) return ('Chrome: ' + sys.chrome)
    if (sys.opera) return ('Opera: ' + sys.opera)
    if (sys.safari) return ('Safari: ' + sys.safari)
    return 'Unkonwn'
}

4.2 getOS

/**
 * 
 * @desc 获取操作系统类型
 * @return {String} 
 */
function getOS() {
    var userAgent = 'navigator' in window && 'userAgent' in navigator && navigator.userAgent.toLowerCase() || '';
    var vendor = 'navigator' in window && 'vendor' in navigator && navigator.vendor.toLowerCase() || '';
    var appVersion = 'navigator' in window && 'appVersion' in navigator && navigator.appVersion.toLowerCase() || '';

    if (/mac/i.test(appVersion)) return 'MacOSX'
    if (/win/i.test(appVersion)) return 'windows'
    if (/linux/i.test(appVersion)) return 'linux'
    if (/iphone/i.test(userAgent) || /ipad/i.test(userAgent) || /ipod/i.test(userAgent)) 'ios'
    if (/android/i.test(userAgent)) return 'android'
    if (/win/i.test(appVersion) && /phone/i.test(userAgent)) return 'windowsPhone'
}

5.Dom

5.1 getScrollTop

/**
 * 
 * @desc 获取滚动条距顶部的距离
 */
function getScrollTop() {
    return (document.documentElement && document.documentElement.scrollTop) || document.body.scrollTop;
}

5.2 offset

/**
 * 
 * @desc  获取一个元素的距离文档(document)的位置,类似jQ中的offset()
 * @param {HTMLElement} ele 
 * @returns { {left: number, top: number} }
 */
function offset(ele) {
    var pos = {
        left: 0,
        top: 0
    };
    while (ele) {
        pos.left += ele.offsetLeft;
        pos.top += ele.offsetTop;
        ele = ele.offsetParent;
    };
    return pos;
}

5.3 scrollTo

var getScrollTop = require('./getScrollTop');
var setScrollTop = require('./setScrollTop');
var requestAnimFrame = (function () {
    return window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        function (callback) {
            window.setTimeout(callback, 1000 / 60);
        };
})();
/**
 * 
 * @desc  在${duration}时间内,滚动条平滑滚动到${to}指定位置
 * @param {Number} to 
 * @param {Number} duration 
 */
function scrollTo(to, duration) {
    if (duration < 0) {
        setScrollTop(to);
        return
    }
    var diff = to - getScrollTop();
    if (diff === 0) return
    var step = diff / duration * 10;
    requestAnimationFrame(
        function () {
            if (Math.abs(step) > Math.abs(diff)) {
                setScrollTop(getScrollTop() + diff);
                return;
            }
            setScrollTop(getScrollTop() + step);
            if (diff > 0 && getScrollTop() >= to || diff < 0 && getScrollTop() <= to) {
                return;
            }
            scrollTo(to, duration - 16);
        });
}

5.4 setScrollTop

/**
 * 
 * @desc 设置滚动条距顶部的距离
 */
function setScrollTop(value) {
    window.scrollTo(0, value);
    return value;
}

6.Keycode

6.1 getKeyName

var keyCodeMap = {
    8: 'Backspace',
    9: 'Tab',
    13: 'Enter',
    16: 'Shift',
    17: 'Ctrl',
    18: 'Alt',
    19: 'Pause',
    20: 'Caps Lock',
    27: 'Escape',
    32: 'Space',
    33: 'Page Up',
    34: 'Page Down',
    35: 'End',
    36: 'Home',
    37: 'Left',
    38: 'Up',
    39: 'Right',
    40: 'Down',
    42: 'Print Screen',
    45: 'Insert',
    46: 'Delete',

    48: '0',
    49: '1',
    50: '2',
    51: '3',
    52: '4',
    53: '5',
    54: '6',
    55: '7',
    56: '8',
    57: '9',

    65: 'A',
    66: 'B',
    67: 'C',
    68: 'D',
    69: 'E',
    70: 'F',
    71: 'G',
    72: 'H',
    73: 'I',
    74: 'J',
    75: 'K',
    76: 'L',
    77: 'M',
    78: 'N',
    79: 'O',
    80: 'P',
    81: 'Q',
    82: 'R',
    83: 'S',
    84: 'T',
    85: 'U',
    86: 'V',
    87: 'W',
    88: 'X',
    89: 'Y',
    90: 'Z',

    91: 'Windows',
    93: 'Right Click',

    96: 'Numpad 0',
    97: 'Numpad 1',
    98: 'Numpad 2',
    99: 'Numpad 3',
    100: 'Numpad 4',
    101: 'Numpad 5',
    102: 'Numpad 6',
    103: 'Numpad 7',
    104: 'Numpad 8',
    105: 'Numpad 9',
    106: 'Numpad *',
    107: 'Numpad +',
    109: 'Numpad -',
    110: 'Numpad .',
    111: 'Numpad /',

    112: 'F1',
    113: 'F2',
    114: 'F3',
    115: 'F4',
    116: 'F5',
    117: 'F6',
    118: 'F7',
    119: 'F8',
    120: 'F9',
    121: 'F10',
    122: 'F11',
    123: 'F12',

    144: 'Num Lock',
    145: 'Scroll Lock',
    182: 'My Computer',
    183: 'My Calculator',
    186: ';',
    187: '=',
    188: ',',
    189: '-',
    190: '.',
    191: '/',
    192: '`',
    219: '[',
    220: '\\',
    221: ']',
    222: '\''
};
/**
 * @desc 根据keycode获得键名
 * @param  {Number} keycode 
 * @return {String}
 */
function getKeyName(keycode) {
    if (keyCodeMap[keycode]) {
        return keyCodeMap[keycode];
    } else {
        console.log('Unknow Key(Key Code:' + keycode + ')');
        return '';
    }
};

7.Object

7.1 deepClone

/**
 * @desc 深拷贝,支持常见类型
 * @param {Any} values
 */
function deepClone(values) {
    var copy;

    // Handle the 3 simple types, and null or undefined
    if (null == values || "object" != typeof values) return values;

    // Handle Date
    if (values instanceof Date) {
        copy = new Date();
        copy.setTime(values.getTime());
        return copy;
    }

    // Handle Array
    if (values instanceof Array) {
        copy = [];
        for (var i = 0, len = values.length; i < len; i++) {
            copy[i] = deepClone(values[i]);
        }
        return copy;
    }

    // Handle Object
    if (values instanceof Object) {
        copy = {};
        for (var attr in values) {
            if (values.hasOwnProperty(attr)) copy[attr] = deepClone(values[attr]);
        }
        return copy;
    }

    throw new Error("Unable to copy values! Its type isn't supported.");
}

7.2 isEmptyObject

/**
 * 
 * @desc   判断`obj`是否为空
 * @param  {Object} obj
 * @return {Boolean}
 */
function isEmptyObject(obj) {
    if (!obj || typeof obj !== 'object' || Array.isArray(obj))
        return false
    return !Object.keys(obj).length
}

8.Random

8.1 randomColor

/**
 * 
 * @desc 随机生成颜色
 * @return {String} 
 */
function randomColor() {
    return '#' + ('00000' + (Math.random() * 0x1000000 << 0).toString(16)).slice(-6);
}

8.2 randomNum 

/**
 * 
 * @desc 生成指定范围随机数
 * @param  {Number} min 
 * @param  {Number} max 
 * @return {Number} 
 */
function randomNum(min, max) {
    return Math.floor(min + Math.random() * (max - min));
}

9.Regexp

9.1 isEmail

/**
 * 
 * @desc   判断是否为邮箱地址
 * @param  {String}  str
 * @return {Boolean} 
 */
function isEmail(str) {
    return /\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/.test(str);
}

9.2 isIdCard

/**
 * 
 * @desc  判断是否为身份证号
 * @param  {String|Number} str 
 * @return {Boolean}
 */
function isIdCard(str) {
    return /^(^[1-9]\d{7}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])\d{3}$)|(^[1-9]\d{5}[1-9]\d{3}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])((\d{4})|\d{3}[Xx])$)$/.test(str)
}

9.3 isPhoneNum

/**
 * 
 * @desc   判断是否为手机号
 * @param  {String|Number} str 
 * @return {Boolean} 
 */
function isPhoneNum(str) {
    return /^(0|86|17951)?(13[0-9]|15[012356789]|17[678]|18[0-9]|14[57])[0-9]{8}$/.test(str)
}

9.4 isUrl

/**
 * 
 * @desc   判断是否为URL地址
 * @param  {String} str 
 * @return {Boolean}
 */
function isUrl(str) {
    return /[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)/i.test(str);
}

10.String

10.1 digitUppercase

/**
 * 
 * @desc   现金额转大写
 * @param  {Number} n 
 * @return {String}
 */
function digitUppercase(n) {
    var fraction = ['角', '分'];
    var digit = [
        '零', '壹', '贰', '叁', '肆',
        '伍', '陆', '柒', '捌', '玖'
    ];
    var unit = [
        ['元', '万', '亿'],
        ['', '拾', '佰', '仟']
    ];
    var head = n < 0 ? '欠' : '';
    n = Math.abs(n);
    var s = '';
    for (var 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 (var i = 0; i < unit[0].length && n > 0; i++) {
        var p = '';
        for (var 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 head + s.replace(/(零.)*零元/, '元')
        .replace(/(零.)+/g, '零')
        .replace(/^整$/, '零元整');
};

11.Support

11.1 isSupportWebP

/**
 * 
 * @desc 判断浏览器是否支持webP格式图片
 * @return {Boolean} 
 */
function isSupportWebP() {
    return !![].map && document.createElement('canvas').toDataURL('image/webp').indexOf('data:image/webp') == 0;
}

12.Time

12.1 formatPassTime

/**
 * @desc   格式化${startTime}距现在的已过时间
 * @param  {Date} startTime 
 * @return {String}
 */
function formatPassTime(startTime) {
    var currentTime = Date.parse(new Date()),
        time = currentTime - startTime,
        day = parseInt(time / (1000 * 60 * 60 * 24)),
        hour = parseInt(time / (1000 * 60 * 60)),
        min = parseInt(time / (1000 * 60)),
        month = parseInt(day / 30),
        year = parseInt(month / 12);
    if (year) return year + "年前"
    if (month) return month + "个月前"
    if (day) return day + "天前"
    if (hour) return hour + "小时前"
    if (min) return min + "分钟前"
    else return '刚刚'
}

12.2 formatRemainTime

/**
 * 
 * @desc   格式化现在距${endTime}的剩余时间
 * @param  {Date} endTime  
 * @return {String}
 */
function formatRemainTime(endTime) {
    var startDate = new Date(); //开始时间
    var endDate = new Date(endTime); //结束时间
    var t = endDate.getTime() - startDate.getTime(); //时间差
    var d = 0,
        h = 0,
        m = 0,
        s = 0;
    if (t >= 0) {
        d = Math.floor(t / 1000 / 3600 / 24);
        h = Math.floor(t / 1000 / 60 / 60 % 24);
        m = Math.floor(t / 1000 / 60 % 60);
        s = Math.floor(t / 1000 % 60);
    }
    return d + "天 " + h + "小时 " + m + "分钟 " + s + "秒";
}

13.Url

13.1 parseQueryString

/**
 * 
 * @desc   url参数转对象
 * @param  {String} url  default: window.location.href
 * @return {Object} 
 */
function parseQueryString(url) {
    url = url == null ? window.location.href : url
    var search = url.substring(url.lastIndexOf('?') + 1)
    if (!search) {
        return {}
    }
    return JSON.parse('{"' + decodeURIComponent(search).replace(/"/g, '\\"').replace(/&/g, '","').replace(/=/g, '":"') + '"}')
}

13.2 stringfyQueryString

/**
 * 
 * @desc   对象序列化
 * @param  {Object} obj 
 * @return {String}
 */
function stringfyQueryString(obj) {
    if (!obj) return '';
    var pairs = [];

    for (var key in obj) {
        var value = obj[key];

        if (value instanceof Array) {
            for (var i = 0; i < value.length; ++i) {
                pairs.push(encodeURIComponent(key + '[' + i + ']') + '=' + encodeURIComponent(value[i]));
            }
            continue;
        }

        pairs.push(encodeURIComponent(key) + '=' + encodeURIComponent(obj[key]));
    }

    return pairs.join('&');
}

14.Function

14.1 throttle

/**
 * @desc   函数节流。
 * 适用于限制`resize`和`scroll`等函数的调用频率
 *
 * @param  {Number}    delay          0 或者更大的毫秒数。 对于事件回调,大约100或250毫秒(或更高)的延迟是最有用的。
 * @param  {Boolean}   noTrailing     可选,默认为false。
 *                                    如果noTrailing为true,当节流函数被调用,每过`delay`毫秒`callback`也将执行一次。
 *                                    如果noTrailing为false或者未传入,`callback`将在最后一次调用节流函数后再执行一次.
 *                                    (延迟`delay`毫秒之后,节流函数没有被调用,内部计数器会复位)
 * @param  {Function}  callback       延迟毫秒后执行的函数。`this`上下文和所有参数都是按原样传递的,
 *                                    执行去节流功能时,调用`callback`。
 * @param  {Boolean}   debounceMode   如果`debounceMode`为true,`clear`在`delay`ms后执行。
 *                                    如果debounceMode是false,`callback`在`delay` ms之后执行。
 *
 * @return {Function}  新的节流函数
 */
function throttle(delay, noTrailing, callback, debounceMode) {

    // After wrapper has stopped being called, this timeout ensures that
    // `callback` is executed at the proper times in `throttle` and `end`
    // debounce modes.
    var timeoutID;

    // Keep track of the last time `callback` was executed.
    var lastExec = 0;

    // `noTrailing` defaults to falsy.
    if (typeof noTrailing !== 'boolean') {
        debounceMode = callback;
        callback = noTrailing;
        noTrailing = undefined;
    }

    // The `wrapper` function encapsulates all of the throttling / debouncing
    // functionality and when executed will limit the rate at which `callback`
    // is executed.
    function wrapper() {

        var self = this;
        var elapsed = Number(new Date()) - lastExec;
        var args = arguments;

        // Execute `callback` and update the `lastExec` timestamp.
        function exec() {
            lastExec = Number(new Date());
            callback.apply(self, args);
        }

        // If `debounceMode` is true (at begin) this is used to clear the flag
        // to allow future `callback` executions.
        function clear() {
            timeoutID = undefined;
        }

        if (debounceMode && !timeoutID) {
            // Since `wrapper` is being called for the first time and
            // `debounceMode` is true (at begin), execute `callback`.
            exec();
        }

        // Clear any existing timeout.
        if (timeoutID) {
            clearTimeout(timeoutID);
        }

        if (debounceMode === undefined && elapsed > delay) {
            // In throttle mode, if `delay` time has been exceeded, execute
            // `callback`.
            exec();

        } else if (noTrailing !== true) {
            // In trailing throttle mode, since `delay` time has not been
            // exceeded, schedule `callback` to execute `delay` ms after most
            // recent execution.
            //
            // If `debounceMode` is true (at begin), schedule `clear` to execute
            // after `delay` ms.
            //
            // If `debounceMode` is false (at end), schedule `callback` to
            // execute after `delay` ms.
            timeoutID = setTimeout(debounceMode ? clear : exec, debounceMode === undefined ? delay - elapsed : delay);
        }

    }

    // Return the wrapper function.
    return wrapper;

};

14.2 debounce

/**
 * @desc 函数防抖 
 * 与throttle不同的是,debounce保证一个函数在多少毫秒内不再被触发,只会执行一次,
 * 要么在第一次调用return的防抖函数时执行,要么在延迟指定毫秒后调用。
 * @example 适用场景:如在线编辑的自动存储防抖。
 * @param  {Number}   delay         0或者更大的毫秒数。 对于事件回调,大约100或250毫秒(或更高)的延迟是最有用的。
 * @param  {Boolean}  atBegin       可选,默认为false。
 *                                  如果`atBegin`为false或未传入,回调函数则在第一次调用return的防抖函数后延迟指定毫秒调用。
                                    如果`atBegin`为true,回调函数则在第一次调用return的防抖函数时直接执行
 * @param  {Function} callback      延迟毫秒后执行的函数。`this`上下文和所有参数都是按原样传递的,
 *                                  执行去抖动功能时,,调用`callback`。
 *
 * @return {Function} 新的防抖函数。
 */
var throttle = require('./throttle');
function debounce(delay, atBegin, callback) {
    return callback === undefined ? throttle(delay, atBegin, false) : throttle(delay, callback, atBegin !== false);
};

https://www.cnblogs.com/qianduantuanzhang/p/8245049.html




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