1.1 built-in objects Case

Case 1: Find the character 'o' to appear and the number of 
function Find (STR) { 
    var index = str.indexOf ( 'o'); 
    var NUM = 0; 
    the while (index == -1!) { 
        The console.log ( index); // position 
        NUM ++; 
        index = str.indexOf ( 'O', + index. 1); 
    } 
    the console.log (NUM); // number 
} 
    Find ( 'abcoefoxyozzopp');      


case 2: an array of de-duplication 
function qc (ARR) { 
    var newArr = []; // Create a new array 
    for (var I = 0; I <arr.length; I ++) { 
        IF (newArr.indexOf (ARR [I]) == -1) { 
            newArr .push (arr [i]); // Add a new query is less than the value of the array 
        } 
    } 
    return newArr; 
} 
    the console.log (QC ([. 1,. 3,. 5,. 1,. 5, 2])); //. 1 , 3,5,2