Count number of occurrences for each char in a string

Question

I want to count the number of occurrences of each character in a given string using JavaScript.

For example:

var str = \"I want to count the number         


        

Answer 1

    function cauta() {

        var str = document.form.stringul.value;
        str = str.toLowerCase();
        var tablou = [];

        k = 0;
        //cautarea caracterelor unice
        for (var i = 0, n = 0; i < str.length; i++) {
            for (var j = 0; j < tablou.length; j++) {
                if (tablou[j] == str[i]) k = 1;
            }
            if (k != 1) {
                if (str[i] != ' ')
                    tablou[n] = str[i]; n++;
            }
            k = 0;
        }
        //numararea aparitilor
        count = 0;
        for (var i = 0; i < tablou.length; i++) {
            if(tablou[i]!=null){
            char = tablou[i];
            pos = str.indexOf(char);
            while (pos > -1) {
                ++count;
                pos = str.indexOf(char, ++pos);

            }

            document.getElementById("rezultat").innerHTML += tablou[i] + ":" + count + '\n';
            count = 0;
        }
        }

    }

This function will put each unique char in array, and after will find the appearances of each char in str. In my Case, i get and put data into