一个简单的数组问题

[zjroland]

有一个数组：var array = [{PhotoID: 1, Photo: "14829241385320.jpg", Caption: "adawd"},{PhotoID: 2, Photo: "14829241385320.jpg"},{PhotoID: 3, Photo: "572953512078570.jpg",Caption: "tadawd"},{PhotoID: 4, Photo: "57299966068780.jpg",Caption: "dadawd"}];
其中PhotoID 为2的那个没有Caption，如何能把这个没有Caption的item找出来？

[天际的海浪]

var array = [{PhotoID: 1, Photo: "14829241385320.jpg", Caption: "adawd"},{PhotoID: 2, Photo: "14829241385320.jpg"},{PhotoID: 3, Photo: "572953512078570.jpg",Caption: "tadawd"},{PhotoID: 4, Photo: "57299966068780.jpg",Caption: "dadawd"}];

var na = array.filter(function(v, i){
	return !("Caption" in v);
});

alert(JSON.stringify(na,null,4));