目標：實現成員為 Object 的陣列的去重。

注意，這裡的陣列成員為 Object，而不是數值或者字串。

呼叫方法：

arr = distinct_arr_element(arr);

函式：

/*
 * 在陣列中去除重複項（）
 */
var distinct_arr_element = function( arr ){

    if( !arr ) return null ;

    var resultArr = [];

    $(arr).each( function( index, el ){
        var notExist = true ;
        $(resultArr).each( function
 
(i,element){
            if( isObjectValueEqual( el, element ) ){
                notExist = false ;
                return false ;
            }
        });
        if( notExist ) 
            resultArr.push( el );
    });

    return resultArr ;
}

/*
 * 判斷兩個 Object 的值是否相等
 */
function isObjectValueEqual
 
(a, b) {
    // Of course, we can do it use for in Create arrays of property names
    var aProps = Object.getOwnPropertyNames(a);
    var bProps = Object.getOwnPropertyNames(b);

    // If number of properties is different, objects are not equivalent
    if (aProps.length != bProps.length) {
        return
 
 false;
    }

    for ( var i = 0; i < aProps.length; i++ ) {
        var propName = aProps[i];

        // If values of same property are not equal, objects are not equivalent
        if (a[propName] !== b[propName]) {
            return false;
        }
    }

    // If we made it this far, objects are considered equivalent
    return true;
}