javascript常用实例的实现与封装1

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1去除字符串空格

//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){    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;    }}

2字母大小写切换

/*type1:首字母大写   2：首页母小写3：大小写转换4：全部大写5：全部小写 * *///changeCase('asdasd',1)//Asdasdfunction changeCase(str,type){    function ToggleCase(str) {        var itemText = ""        str.split("").forEach(            function (item) {                if (/^([a-z]+)/.test(item)) {                    itemText += item.toUpperCase();                }                else if (/^([A-Z]+)/.test(item)) {                    itemText += item.toLowerCase();                }                else{                    itemText += item;                }            });        return itemText;    }    switch (type) {        case 1:            return str.replace(/^(\w)(\w+)/, function (v, v1, v2) {                return v1.toUpperCase() + v2.toLowerCase();            });        case 2:            return str.replace(/^(\w)(\w+)/, function (v, v1, v2) {                return v1.toLowerCase() + v2.toUpperCase();            });        case 3:            return ToggleCase(str);        case 4:            return str.toUpperCase();        case 5:            return str.toLowerCase();        default:            return str;    }}

3字符串循环复制

//repeatStr(str->字符串, count->次数)//repeatStr('123',3)//"123123123"function repeatStr(str, count) {    var text = '';    for (var i = 0; i < count; i++) {        text += str;    }    return text;}

4字符串替换

//repeatStr(str->字符串, count->次数)//repeatStr('123',3)//"123123123"function repeatStr(str, count) {    var text = '';    for (var i = 0; i < count; i++) {        text += str;    }    return text;}

5替换*

//replaceStr(字符串,字符格式, 替换方式,替换的字符（默认*）)function replaceStr(str, regArr, type,ARepText) {    var regtext = '', Reg = null,replaceText=ARepText||'*';    //replaceStr('18819322663',[3,5,3],0)    //188*****663    //repeatStr是在上面定义过的（字符串循环复制），大家注意哦    if (regArr.length === 3 && type === 0) {        regtext = '(\\w{' + regArr[0] + '})\\w{' + regArr[1] + '}(\\w{' + regArr[2] + '})'        Reg = new RegExp(regtext);        var replaceCount = repeatStr(replaceText, regArr[1]);        return str.replace(Reg, '$1' + replaceCount + '$2')    }    //replaceStr('asdasdasdaa',[3,5,3],1)    //***asdas***    else if (regArr.length === 3 && type === 1) {        regtext = '\\w{' + regArr[0] + '}(\\w{' + regArr[1] + '})\\w{' + regArr[2] + '}'        Reg = new RegExp(regtext);        var replaceCount1 = repeatSte(replaceText, regArr[0]);        var replaceCount2 = repeatSte(replaceText, regArr[2]);        return str.replace(Reg, replaceCount1 + '$1' + replaceCount2)    }    //replaceStr('1asd88465asdwqe3',[5],0)    //*****8465asdwqe3    else if (regArr.length === 1 && type == 0) {        regtext = '(^\\w{' + regArr[0] +  '})'        Reg = new RegExp(regtext);        var replaceCount = repeatSte(replaceText, regArr[0]);        return str.replace(Reg, replaceCount)    }    //replaceStr('1asd88465asdwqe3',[5],1,'+')    //"1asd88465as+++++"    else if (regArr.length === 1 && type == 1) {        regtext = '(\\w{' + regArr[0] +  '}$)'        Reg = new RegExp(regtext);        var replaceCount = repeatSte(replaceText, regArr[0]);        return str.replace(Reg, replaceCount)    }}

6检测字符串

//checkType('165226226326','phone')//false//大家可以根据需要扩展function checkType (str, type) {    switch (type) {        case 'email':            return /^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/.test(str);        case 'phone':            return /^1[3|4|5|7|8][0-9]{9}$/.test(str);        case 'tel':            return /^(0\d{2,3}-\d{7,8})(-\d{1,4})?$/.test(str);        case 'number':            return /^[0-9]$/.test(str);        case 'english':            return /^[a-zA-Z]+$/.test(str);        case 'chinese':            return /^[\u4E00-\u9FA5]+$/.test(str);        case 'lower':            return /^[a-z]+$/.test(str);        case 'upper':            return /^[A-Z]+$/.test(str);        default :            return true;    }}

7检测密码强度

//checkPwd('12asdASAD')//3(强度等级为3)function checkPwd(str) {    var nowLv = 0;    if (str.length < 6) {        return nowLv    }    ;    if (/[0-9]/.test(str)) {        nowLv++    }    ;    if (/[a-z]/.test(str)) {        nowLv++    }    ;    if (/[A-Z]/.test(str)) {        nowLv++    }    ;    if (/[\.|-|_]/.test(str)) {        nowLv++    }    ;    return nowLv;}

8随机码（toString详解）

//count取值范围0-36//randomNumber(10)//"2584316588472575"//randomNumber(14)//"9b405070dd00122640c192caab84537"//Math.random().toString(36).substring(2);//"83vhdx10rmjkyb9"function randomNumber(count){   return Math.random().toString(count).substring(2);}

9查找字符串

function countStr (str,strSplit){    return str.split(strSplit).length-1}var strTest='sad44654blog5a1sd67as9dablog4s5d16zxc4sdweasjkblogwqepaskdkblogahseiuadbhjcibloguyeajzxkcabloguyiwezxc967'//countStr(strTest,'blog')//6

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