JavaScript_ECMA5数组新特性详解

var result = arr.every(function(item , index , array){
　　return item >= 1 ;
　　});
alert(result); //true

 var result = arr.filter(function(item , index , array){
return item > 2 ;
});
alert(result); //3,4,5,4,3

 arr.forEach(function(item, index, array){
　　alert(item); //1,2,3,4,5,4,3,2,1
}); 

var result = arr.map(function(item, index, array){
　　return item*10;
});
alert(result); //10,20,30,40,50,40,30,20,10   

var result = arr.some(function(item, index, array){
　　return item >5 ;
});
alert(result); //false 

var result = arr.reduce(function(prev , cur , index , array){
　　return prev + cur ;
});
alert(result) //25;

var result = arr.reduceRight(function(prev , cur , index , array){
　　return prev + cur ;
});
alert(result) //25;