Js common validation tool

1. Verify that the URL is valid

function validateURL(textval) {
    const urlregex = /^(https? |ftp):\/\/([a-zA-Z0-9.-]+(:[a-zA-Z0-9.&%$-]+)*@)*((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]?) (\. (25 [0 to 5] | 2 [0 to 4] [0-9] [0-9] {2} | 1 | [1-9]? [0-9])){3}|([a-zA-Z0-9-]+\.) *[a-zA-Z0-9-]+\.(com|edu|gov|int|mil|net|org|biz|arpa|info|name|pro|aero|coop|museum|[a-zA-Z]{2}))(:[0-9]+)*(\/($|[a-zA- Z0-9.,?'\\+&%$#=~_-]+))*$/
    return urlregex.test(textval)
}
/ / case
validateURL("https://juejin.cn/editor/drafts/6969756478932516894") //true
validateURL("https://editor/drafts/6969756478932516894")           //false
validateURL("https://editor.commmmm/drafts/6969756478932516894")   //false
validateURL("ht://editor.com/drafts/6969756478932516894")          //false
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2. Verify that the email address is valid

function isEmail(s) {
    return / ^ ([a - zA - Z0 - _ - 9]) + @ ([a zA - Z0 - _ - 9]) + ((. [a zA - Z0 - _ - 9] {2, 3})} {1, 2) $/.test(s)
}
/ / case
isEmail("[email protected]") //true
isEmail("[email protected]")        //true
isEmail("ddgasd.com")         //false
isEmail("[email protected]")    //false
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2. Check whether the mobile phone number is valid

function isMobile(s) {
    return / ^ 1 [3 4 5 7 | | | | 8] [0-9] {9} $/.test(s)
}
/ / case
isMobile("13556525845")  //true
isMobile("11454787548")  //false
isMobile("135555555554") //false
isMobile("135555555")    //false
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3. Check whether there is no content

function isNoval(val) {
    if (typeof val == 'boolean') {
        return false;
    }
    if (typeof val == 'number') {
        return false;
    }
    if (val instanceof Array) {
        if (val.length == 0) return true;
    } else if (val instanceof Object) {
        if (JSON.stringify(val) === '{}') return true;
    } else {
        if (val == 'null' || val == null || val == 'undefined' || val == undefined || val == ' ') return true;
        return false;
    }
    return false;
}
/ / case
isNoval(0)    //false
isNoval(null) //true
isNoval({})   //true
isNoval("")   //true
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4. Verify whether it is a valid ID number

function isIdcard(code) {
    code+=' '
    let list = [];
    let result = false;
    let msg = ' ';
    let city = {
        11: "Beijing".12: "Tianjin".13: "Hebei".14: "Shanxi".15: Inner Mongolia.21: "Liaoning".22: "Jilin".23: "Heilongjiang".31: "Shanghai".32: "Jiangsu".33: "Zhejiang".34: "Anhui province".35: "Fujian".36: "Jiangxi".37: "Shandong".41: "Henan".42: "Hubei".43: "Hunan".44: "Guangdong".45: "Guangxi".46: "Hainan".50: "Chongqing".51: "Sichuan".52: "Guizhou".53: "Yunnan".54: "Tibet".61: "Shaanxi".62: "Gansu".63: "Qinghai".64: "The ningxia".65: "Xinjiang".71: "Taiwan".81: "Hong Kong".82: "Macau".91: "Foreign"
    };
    if(! isNoval(code)) {if (code.length == 18) {
            if(! code || !/(^\d{18}$)|(^\d{17}(\d|X|x)$)/.test(code)) {
                msg = "Incorrect format of id number";
            } else if(! city[code.substr(0.2)]) {
                msg = "Address code error";
            } else {
                // The last check bit of the 18-bit id card needs to be verified
                code = code.split(' ');
                / / ∑ * Wi (ai) (mod)
                // Weighting factor
                var factor = [7.9.10.5.8.4.2.1.6.3.7.9.10.5.8.4.2];
                / / check digit
                var parity = [1.0.'X'.9.8.7.6.5.4.3.2.'x'];
                var sum = 0;
                var ai = 0;
                var wi = 0;
                for (var i = 0; i < 17; i++) {
                    ai = code[i];
                    wi = factor[i];
                    sum += ai * wi;
                }
                if (parity[sum % 11] != code[17]) {
                    msg = "Incorrect verification digit of CERTIFICATE number";
                } else {
                    result = true;
                    msg = "Verification of ID number successful"; }}}else {
            msg = "No longer than 18 digits"; }}else {
        msg = "No blank id number.";
    }
    list.push(result);
    list.push(msg);
    return list;
}

/ / case
isIdcard()                      // [false, "ID number cannot be empty "]
isIdcard(11021547575)           // [false, "ID no longer than 18 digits "]
isIdcard(110215475754487875)    // [false, "ID check bit error "]
isIdcard("142636198604225314")  // [true, "id verification succeeded "]
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4. Verify whether JSON can be parsed

function isJSON(str) {
    if (typeof str == 'string') {
        try {
            var obj=JSON.parse(str);
            if(typeof obj == 'object' && obj ){
                return true;
            }else{
                return false; }}catch(e) {
            console.log('Error:'+str+'!!!!!! '+e);
            return false; }}console.log('Must be a string')
    return false
}
/ / case
isJSON(123)                     //false
isJSON('{name:1}')              //false
isJSON('{"name":"Liza"}')       //true
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