/**javascript 数组扩展实现 php array_count_values() 函数功能*/(function(window){    if ( window.ActiveXObject ) {        window.Array.prototype.indexOf = function(item){            for( var i = 0; i < this.length; i++ ) {                if ( this[i] === item ) return i;            }            return -1;        }    }    window.Array.prototype.countValues = function() {        var keys = [];        var values = {};               for( var i = 0; i < this.length; i++ ) {            if ( keys.indexOf( this[i] ) != -1 ) {                values[this[i]] += 1;            } else {                keys.push( this[i] );                values[this[i]] = 1;            }        }               return values;    }})(window);