JavaScript face questions

1
var s= ' Border-bottom-color '. Split ('-');
var tmp=[];
For (I in S)
{
var first=s[i].charat (0). toUpperCase ();
Tmp.push (' +first+s[i].substring (1));
}
var str=tmp.join ('-');
Console.log (str);

var s= ' Border-bottom-color ';
function Test (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 (");

}

Test (str);

function test ()
{
var re=/-(\w)/g;
Return Str.replace (Re,function ($0,$1) {
return $1.touppercase ();
});
}

var str= ' Huhusahuhdisjiji ';
var num=0;
var value= ';
function test ()
{
var obj={};
for (Var i=0;i<str.length;i++)
{
Obj[str[i]]=[];
}
Obj[str[i]].push (Str[i]);
}
for (var attr in obj)
{
if (num<obj[attr].length)
{
Num=obj[attr].length;
VALUE=OBJ[ATTR][0];
}
Return ' appears the most character is ' + ' value ' + appears +num;
}

JavaScript face questions