2-1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;
}
}
2-2字母大小写切换
/*type
1: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)
//Asdasd
function 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;
}
}
2-3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;
}
2-4字符串替换
//字符串替换(字符串,要替换的字符,替换成什么)
function replaceAll(str,AFindText,ARepText){
raRegExp = new RegExp(AFindText,"g");
return str.replace(raRegExp,ARepText);
}
2-5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)
}
}
2-6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 /^(0d{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;
}
}
2-7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;
}
2-8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);
}
2-9查找字符串
可能标题会有点误导，下面我就简单说明一个需求，在字符串'sad44654blog5a1sd67as9dablog4s5d16zxc4sdweasjkblogwqepaskdkblogahseiuadbhjcibloguyeajzxkcabloguyiwezxc967'中找出'blog'的出现次数。代码如下
function countStr (str,strSplit){
return str.split(strSplit).length-1
}
var strTest='sad44654blog5a1sd67as9dablog4s5d16zxc4sdweasjkblogwqepaskdkblogahseiuadbhjcibloguyeajzxkcabloguyiwezxc967'
//countStr(strTest,'blog')
//6