如何获取json文件并在请求之前返回之前使用它？

Question

在某些时候我想获取json文件并使用其中的数据，所以我这样做：

var obj = $.getJSON( "package.json", function() {
  console.log( " i have json now !" );
})
alert(obj[0].email);
//// i use obj here but it keep giving me undefined , i think it's about non blocking way of get json but i donna know how to make it right   

Answer 1

var obj = $.getJSON( "package.json", function(data) {
  console.log( " i have json now !" );
});

obj.done(function(data) {
  alert(data[0].email);
});

这会在收到数据时发出警告。