版权声明:欢迎转载 https://blog.csdn.net/feinifi/article/details/85343425
1、写一个字符串转驼峰的方法?
-例如:border-bottom-color->borderBottomColor
2、查找字符串中出现最多次数的字符和个数?
-例如:sdjksfssscfssdd->字符最多的是s,出现了7次
3、如何给字符串加千分符?
-例如:3562123761->3,562,123,761
var str = "border-bottom-color";
function test1(str){
var arr = str.split("-");
for(var i=1;i<arr.length;i++){
arr[i] = arr[i].charAt(0).toUpperCase() + arr[i].substring(1);
}
return arr.join("");
}
console.log("1[common ]:",test1(str));
function test1reg(str){
var reg = /-(\w)/g
return str.replace(reg,function($0,$1){
return $1.toUpperCase();
});
}
console.log("1[regular]:",test1reg(str));
var str2 = "sdjksfssscfssdd";
function test2(str){
var obj = {};
var num = 0;
var value = "";
for(var i=0;i<str.length;i++){
if( !obj[ str[i] ] ){
obj[ str[i] ] = [];
}
obj[ str[i] ].push(str[i]);
}
for(var arr in obj){
if(num<obj[arr].length){
num = obj[arr].length;
value = obj[arr][0];
}
}
return {key:value,count:num};
}
console.log("2[common ]:",test2(str2));
function test2reg(str){
var arr = str.split("");
arr.sort();
var str = arr.join("");
var reg = /(\w)\1+/g;
var num = 0;
var value = "";
str.replace(reg,function($0,$1){
if(num<$0.length){
num = $0.length;
value = $1;
}
});
return {key:value,count:num};
}
console.log("2[regular]:",test2reg(str2));
var str3 = "3562123761";
function test3(str){
var prev = "";
var iNum = str.length%3;
var arr = [];
if(iNum!=0){
prev = str.substring(0,iNum);
arr.push(prev);
}
str = str.substring(iNum);
for(var i=0;i<str.length;i+=3){
arr.push(str.substring(i,i+3));
}
return arr.join(","); // <- [3,562,123,761].join(",")
}
console.log("3[common ]:",test3(str3));
function test3reg(str){
var reg = /(?=(?!\b)(\d{3})+$)/g
return str.replace(reg,",");
}
console.log("3[regular]:",test3reg(str3));
运行结果: