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项目中常用的一些方法

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1、三位数分隔符

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function format_number(n) {
    if (!isNaN(n) && (n != null)) {
        var b = parseInt(n).toString();
        var len = b.length;
        if (n > 0) {
            if (len <= 3) {
                return b;
            }
            var r = len % 3;
            return r > 0 ? b.slice(0, r) + "," + b.slice(r, len).match(/\d{3}/g).join(",") : b.slice(r, len).match(/\d{3}/g).join(",");
        } else {
            if (len <= 4) {
                return b;
            }
            var a = len % 3;
            return a > 0 ? b.slice(0, a) + "," + b.slice(a, len).match(/\d{3}/g).join(",") : b.slice(a, len).match(/\d{3}/g).join(",");
        }
    } else return 0;
}

2、时间转换

1、精确到天

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function getDateByDay(time) {
    let oDate = new Date(time);
    return '' + oDate.getFullYear() + '-' + toTen(oDate.getMonth() + 1) + '-' + toTen(oDate.getDate());
    function toTen(number) {
        return parseInt(number) < 10 ? '0' + number : '' + number;
    }
}

2、精确到分钟

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function getDate(time) {
    let oDate = new Date(time);
    return '' + oDate.getFullYear() + '-' + toTen(oDate.getMonth() + 1) + '-' + toTen(oDate.getDate()) + ' ' + toTen(oDate.getHours()) + ':' + toTen(oDate.getMinutes());
    function toTen(number) {
        return parseInt(number) < 10 ? '0' + number : '' + number;
    }
}

3、URL拼接字符串

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function qs(data) {
    var str = '';
    for (var k in data) {
        if (!data[k]) {
            data[k] = '';
        }
        str += k + '=' + data[k] + '&';
    }
    return str.slice(0, -1)
}

4、将一个二维数组分割成多个二维数组

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//arr需要切割的数组，len每份为多长
function splitArray(arr, len) {
    var a_len = arr.length;
    var result = [];
    for (var i = 0; i < a_len; i += len) {
        result.push(arr.slice(i, i + len));
    }
    return result;
}

5、获取url后面的参数并转换成对象

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function transformUrlToObj(url) {
    var url = url;
    var nameValue;
    var paraString = url.substring(url.indexOf("?") + 1, url.length).split("&");
    var paraObj = {};
    for (var i = 0; nameValue = paraString[i]; i++) {
        var name = nameValue.substring(0, nameValue.indexOf("=")).toLowerCase();
        var value = nameValue.substring(nameValue.indexOf("=") + 1, nameValue.length);
        if (value.indexOf("#") > -1) {
            value = value.split("#")[0];
        }
        paraObj[name] = value;
    }
    //console.log(paraObj);
    return paraObj;
};

6、删除数组中指定的索引下标值

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deleteArr(arr, index) {    
    if (isNaN(index) || index > arr.length) { return false;}
    for (var i = 0, n = 0; i < arr.length; i++) {
        if (arr[i] != arr[index]) {
            arr[n++] = arr[i]
        }
    }
    arr.length -= 1
}
var arr = [1,2,3,4,5];
deleteArr(arr, 1)  //[1,3,4,5]

7、获取当前月之前的12个月（包括本月）

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function get12Months() {
    var monthArr = [];
    var now = new Date();
    var month = parseInt(now.getMonth() + 1);
    var year = now.getFullYear();
    for (var i = 0; i < 12; i++) {
        if (month == 0) {
            --year;
            month = 12;
        }
        var obj = {
            label: year + '年' + (month > 9 ? month : ('0' + month)) + '月',
            str: year + '-' + (month > 9 ? month : ('0' + month))
        };
        monthArr.push(obj);
        --month;
    }
    return monthArr;
}
//var arrMonth = get12Months();
//console.log(arrMonth);

8、数组去重

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const removeDuplicateItems = arr => [...new Set(arr)];
removeDuplicateItems([4, 'fo', 4, 'fo', true, true]);
// [4, "fo", true]

9、平铺二维数组以及多维数组

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const arr = [11, [22, 33], [44, 55], 66];
const flatArr = [].concat(...arr); 
//=> [11, 22, 33, 44, 55, 66]  只能平铺二维数组
通过递归，平铺任意维度的数组
function flattenArray(arr) {
  const flattened = [].concat(...arr);
  return flattened.some(item => Array.isArray(item)) ? flattenArray(flattened) : flattened;
}
const arr = [11, [22, 33], [44, [55, 66, [77, [88]], 99]]];
const flatArr = flattenArray(arr); 
// [11, 22, 33, 44, 55, 66, 77, 88, 99]

10、自定义脱敏

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/***
 * 自定义脱敏
 * @param str(string), begin(number), end(number)
 * @return {String}
 * @constructor
 * */
String.prototype.ribbonDesensitization = function(str, begin, end) {
    if (typeof str == 'string') {
        let arrayStr = str.split('');
        arrayStr.splice(begin, 0, '~');
        arrayStr.splice(end+1, 0, '~');
        str = arrayStr.join('');
        let ruten = str.substring(begin, end+2);
        let arr = [];
        for (let i = 0; i < ruten.length; i++) {
            arr.push('*');
        }
        str = str.replace(ruten, arr.join('')).split('');
        str.splice(begin, 1);
        str.splice(end, 1);
        return str.join('')
    }else {
        throw new Error('不是String类型')
    }
}

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