如何获取jason里面的id

Question

var products=[{ID:1,Name:"a",Price:1},{ID:2,Name:"b",Price:4}];
获取里面的ID用于比较 主要用于push里面内容 使ID不重复 

Answer 1

products[0].ID
products[1].ID
.....要么就是
for (var i;i<products.length;i++)
    document.write(products[i].ID);

Answer 2

var products=[{ID:3,Name:"a",Price:1},{ID:2,Name:"b",Price:4}];
for (aa in products)
{
alert(products[aa].ID)
}

Answer 3

var obj = eval( "(" + products+ ")" );//
alert(obj[0].ID+"-----"+obj[0].Name+"-----"+obj[0].Price);