[JavaScript]

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/ * *

* store localStorage

* /
export const setStore = (name, content) => {

if
(! name)
return
;

if
(
typeof
content ! = =
'string'
) {

content = JSON.stringify(content);

}

window.localStorage.setItem(name, content);
};
/ * *

* get localStorage

* /
export const getStore = name => {

if
(! name)
return
;

return
window.localStorage.getItem(name);
};
/ * *

* delete localStorage

* /
export const removeStore = name => {

if
(! name)
return
;

window.localStorage.removeItem(name);
};
/ * *

* Generate random strings (length can be specified)

* @param len

* @returns {string}

* /
export const randomString = (len) => {

len = len || 8;

let $chars =
'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'
;

/**** removes confusing characters oOLl,9gq,Vv,Uu,I1****/ by default

let maxPos = $chars.length;

let pwd =
' '
;

for
(let i = 0; i < len; i++) {

pwd += $chars.charAt(Math.floor(Math.random() * maxPos));

}

return
pwd;
};
/ * *

* randomWord produces random alphanumeric combinations of any length

* @param randomFlag whether arbitrary length min- Arbitrary length minimum bit [fixed bit] Max - Arbitrary length maximum bit

* @param min

* @param max

* @returns {string}

* Call method:

* Generates a 3-32 bit random string

* randomWord (true, 3, 32). For example: olyOXUF5oDsuMmXl3Mi48

* Generates a random 32-bit string

* randomWord(false,32); For example: fjpnWj29Bb8boiXbLeDF0nxkR4aYcLRl

* /
export const randomWord = (randomFlag, min, max) => {

let str =
""
.

range = min,

arr = [
'0'
.
'1'
.
'2'
.
'3'
.
'4'
.
'5'
.
'6'
.
'7'
.
'8'
.
'9'
.
'a'
.
'b'
.
'c'
.
'd'
.
'e'
.
'f'
.
'g'
.
'h'
.
'i'
.
'j'
.
'k'
.
'l'
.
'm'
.
'n'
.
'o'
.
'p'
.
'q'
.
'r'
.
's'
.
't'
.
'u'
.
'v'
.
'w'
.
'x'
.
'y'
.
'z'
.
'A'
.
'B'
.
'C'
.
'D'
.
'E'
.
'F'
.
'G'
.
'H'
.
'I'
.
'J'
.
'K'
.
'L'
.
'M'
.
'N'
.
'O'
.
'P'
.
'Q'
.
'R'
.
'S'
.
'T'
.
'U'
.
'V'
.
'W'
.
'X'
.
'Y'
.
'Z'
];

// randomly generated

if
(randomFlag) {

range = Math.round(Math.random() * (max - min)) + min;

}

for
(let i = 0; i < range; i++) {

let pos = Math.round(Math.random() * (arr.length - 1));

str += arr[pos];

}

return
str;
};
/ * *

* Get the post-URL parameters

* /
export const GetRequest = () => {

let url = location.search;
// Get the "?" in the url The string following the character

let theRequest =
new
Object();

if
(url.indexOf(
"?"
)! = 1) {

let str = url.substr(1);

let strs = str.split(
"&"
);

for
(let i = 0; i < strs.length; i++) {

theRequest[strs[i].split(
"="
)[0]] = (strs[i].split(
"="
) [1]);

}

}

return
theRequest;
};
/ * *

* Generate random color values

* /
export const 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
The '#'
+ rgb.join(
' '
)
};
/ * *

* Verify id number

* @param el Number input

* @returns {boolean}

* /
export const checkCardNo = (el) => {

let txtval = el.value;

let reg = /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/;

return
reg.test(txtval);
};
/ * *

* Gets the string length in bytes

* @param {String}

* @returns {Boolean}

* /
export const checkLength = (v) => {

let realLength = 0;

let len = v.length;

for
(let i = 0; i < len; i++) {

let charCode = v.charCodeAt(i);

if
(charCode >= 0 && charCode <= 128) realLength += 1;

else
realLength += 2;

}

return
realLength;
};
/ * *

* Determine the wechat browser

* @returns {Boolean}

* /
export const isWeiXin = () => {

let ua = window.navigator.userAgent.toLowerCase();

if
(ua.match(/MicroMessenger/i) ==
'micromessenger'
) {

return
true
;

}
else
{

return
false
;

}
};
/ * *

* write cookies

* /
export const setCookie = (name, value, time) => {

let strsec = getsec(time);

let exp =
new
Date();

exp.setTime(exp.getTime() + strsec * 1);

document.cookie = name +
"="
+ escape(value) +
"; expires="
+ exp.toGMTString();
};
/ * *

* read cookies

* /
export const getCookie = (name) => {

let arr, reg =
new
RegExp(
"(^| )"
+ name +
"= (/ ^; (*). | $)"
);

if
(arr = document.cookie.match(reg))
return
(arr[2]);

else
return
null
;
};
/ * *

* delete cookies

* /
export const delCookie = (name) => {

let exp =
new
Date();

exp.setTime(exp.getTime() - 1);

let cval = getCookie(name);

if
(cval ! =
null
) document.cookie = name +
"="
+ cval +
"; expires="
+ exp.toGMTString();
};
/ * *

* Browser judgment

* Usage examples -- multiple sets of pages to determine whether to display mobile:

* let ua = parseUA();

* if (! ua.mobile) {

* location.href = './pc.html';

*}

* /
export const parseUA = () => {

let u = navigator.userAgent;

let u2 = navigator.userAgent.toLowerCase();

return
{
// Mobile terminal browser version information

trident: u.indexOf(
'Trident'
) > 1,

/ / IE kernel

presto: u.indexOf(
'Presto'
) > 1,

/ / opera kernel

webKit: u.indexOf(
'AppleWebKit'
) > 1,

// Apple, Google kernel

gecko: u.indexOf(
'Gecko'
) > -1 && u.indexOf(
'KHTML'
) == -1,

// The Firefox kernel

mobile: !! u.match(/AppleWebKit.*Mobile.*/),

// Whether it is a mobile terminal

ios: !! u.match(/\(i[^;] +; ( U;) ? CPU.+Mac OS X/),

/ / ios terminal

android: u.indexOf(
'Android'
) > -1 || u.indexOf(
'Linux'
) > 1,

// An Android terminal or uc browser

iPhone: u.indexOf(
'iPhone'
) > 1,

// Whether the browser is iPhone or QQHD

iPad: u.indexOf(
'iPad'
) > 1,

/ / whether the device

webApp: u.indexOf(
'Safari'
) == -1,

// Whether the web should be a program, without a header and a bottom

iosv: u.substr(u.indexOf(
'iPhone OS'
) + 9, 3),

weixin: u2.match(/MicroMessenger/i) ==
"micromessenger"
.

ali: u.indexOf(
'AliApp'
) > 1,

};
};
/ * *

* generate UUID

* @returns {string}

* /
export const generateUUID = () => {

let d =
new
Date().getTime();

let uuid =
'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'
.replace(/[xy]/g,
function
(c) {

let r = (d + Math.random() * 16) % 16 | 0;

d = Math.floor(d / 16);

return
(c ===
'x'
? r : (r & 0x7 | 0x8)).toString(16);

});

return
uuid;
};
/ * *

* Delete the left and right Spaces

* @param str

* @returns {string | * | void}

* /
function
trim(str) {

return
str.replace(/(^\s*)|(\s*$)/g,
""
);
}
/ * *

* Remove the left space

* @param str

* @returns {string | * | void}

* /
function
ltrim(str) {

return
str.replace(/(^\s*)/g,
""
);
}
/ * *

* Delete the space on the right

* @param str

* @returns {string | * | void}

* /
function
rtrim(str) {

return
str.replace(/(\s*$)/g,
""
);
}
/ * *

* Object array to two-dimensional array

* @param objArr

* /
function
obj2Arr(objArr) {

objArr.length > 0 && objArr.map(item => {

return
Object.values(item);

})
}
/ * *

* Find the maximum value of an attribute in the object array

* @param array

* @param item

* @returns val

* /
function
maxItemInObjArr(array, item) {

let max = Math.max.apply(Math, array.map(
function
(obj) {

return
obj[item];

}));

return
max;
}
/ * *

* Determine the current network environment

* /
export const isWifi = () => {

try
{

let wifi =
true
;

let ua = window.navigator.userAgent;

let con = window.navigator.connection;

// If it is wechat

if
(/MicroMessenger/.test(ua)) {

if
(ua.indexOf(
'WIFI'
) > = 0) {

return
true

}
else
{

wifi =
false

}

// If navigator. Connection is supported

}
else
if
(con) {

let network = con.type;

if
(network ! = =
'wifi'
&& network ! = =
'2'
&& network ! = =
'unknown'
) {

wifi =
false

}

}

return
wifi

}
catch
(e) {

return
false

}
};
/ * *

* Capitalize the first letter

* @param str

* @returns {string}

* /
export const fistLetterUpper = (str) => {

return
str.charAt(0).toUpperCase() + str.slice(1);
};
/ * *

* Filter illegal strings

* /
export const illegalFilter = (str) => {

let regEn = /[`~!@
# $% ^ & * () _ + < >? : "{},. / /; '[\]]/im;

Let regCn = /[·!
#￥(--) :; "" ',, |"." ? , 【 】 [\]] / im;

if
(regEn.test(str) || regCn.test(str))
return
false
;

return
true
;
};