简单操作字符串

var str=",,,,,,,,,,,abc,123,4cc,569,dfk,,,,,,,,";
function goArray(str){
    var arr=[];
    var s="";
    var j=0;
    for(var i=0;i<str.length;i++){
        if(str.charAt(i)!=‘,‘&&i!=str.length-1){
            s+=str.charAt(i);
        }
        else if(i==str.length-1&&str.charAt(i)!=‘,‘){
            s+=str.charAt(i);
            arr[j]=s;
        }
        else{
        if(s!=""){
        
        arr[j]=s;
        j++;
        s="";
        }
        }

    }
    console.log(s);
    console.log(arr);
}
console.log("abc");
goArray(str);
console.log(str);

var arr=[‘abc‘,‘123‘,‘jack‘,‘fuck‘,‘669‘];
function goString(arr){
    var str="";
    for(var i=0;i<arr.length;i++){
        if(i!=arr.length-1) str+=arr[i]+‘:‘;
        else{str+=arr[i];}
    }
    console.log(str);
}
goString(arr);

var a="jack";
var b="rose";
function newStr(str1,str2){
    var str=str1+str2;
    console.log(str);
}
newStr(a,b);

var str="Guys,people will not forget you. People loves you.";
function replaceStr(str1,str2,str){
    var num=0;
var ss="";
    for(var i=0;i<str.length;i++){
        if(str.charAt(i)==str1.charAt(0)){
            for(var s=0;s<str1.length-1;s++){
               if(str.charAt(i+s+1)==str1.charAt(s+1)){
                   num++;
                   console.log(" num = "+num);
               } 
            }   
               if(num==str1.length-1){
               num=0;
               ss+=str2;
               i+=str1.length-1;
               console.log("when num==5,num=  "+num);
               console.log("when num==5,s=  "+ss);
               }
               else
                ss+=str.charAt(i);
               num=0;
        }
        else
            ss+=str.charAt(i);
            console.log("when i= "+i+" , s=  "+ss);
    }
    console.log(ss);
}
replaceStr(‘people‘,‘jack‘,str);
console.log(str.replace(/people/g,‘jack‘));

var str="YOUAREJUSTASHITYOUKNOW?";
function cutStr(str1,str){
    var ss=""; 
    var num=0;
    for(var i=0;i<str.length;i++){
        if(str.charAt(i)==str1.charAt(0)){
            for(var j=0;j<str1.length-1;j++){
                if(str.charAt(i+j+1)==str1.charAt(j+1)){num++;}
            }
            if(num==str1.length-1){
                i+=str1.length-1;
            }else{
                ss+=str.charAt(i);
            }
            num=0;
        }else{
            ss+=str.charAt(i);
        }
    }
    console.log(ss);
}
cutStr(‘YOU‘,str);
console.log(str);

var money=‘9899999‘;
var moon="";
function getMoney(money){
    if(money.length<4){
    moon=money;
    return;
    }
    for(var i=0;i<money.length;i++){
        if(i<money.length%3){
            moon+=money[i];
            console.log(‘moon=  ‘+moon);
            if(i==money.length%3-1)
       moon+=‘,‘; 
        }else{
       if((i-money.length%3)%3==0&&i!=money.length%3)
           moon+=‘,‘;
       moon+=money[i];
        }
    }
}
getMoney(money);
console.log(moon);

var str=‘208299‘;
var sin=‘‘;
for(var i=n=str.length; i>0; sin=((n-i--)%3==2&&i!=0?‘,‘+str[i]:str[i])+sin);
console.log(sin);