how to get each char fro, string js code example

Example 1: js for each character in string

for (var i = 0; i < str.length; i++) {
  alert(str.charAt(i));
}

Example 2: count value a to b character javascript

function count (string) {  
  var count = {};
  string.split('').forEach(function(s) {
     count[s] ? count[s]++ : count[s] = 1;
  });
  return count;
}