关于 eval 的报错 Uncaught ReferenceError: False is not defined

var obj ={'id': 16, 'name': '管理员', 'delflag': False, 'grade': 1000000.0}
VM3614:1 Uncaught ReferenceError: False is not defined
at <anonymous>:1:47
(anonymous) @ VM3614:1
var obj
undefined
obj ={'id': 16, 'name': '管理员', 'delflag': False, 'grade': 1000000.0}
VM3633:1 Uncaught ReferenceError: False is not defined
at <anonymous>:1:43
(anonymous) @ VM3633:1
obj = "{'id': 16, 'name': '管理员', 'delflag': False, 'grade': 1000000.0}"
"{'id': 16, 'name': '管理员', 'delflag': False, 'grade': 1000000.0}"
alert(obj)
undefined
var oo =eval("("+obj+")")
VM3699:1 Uncaught ReferenceError: False is not defined
at eval (eval at <anonymous> ((index):1), <anonymous>:1:39)
at <anonymous>:1:9
(anonymous) @ VM3699:1
(anonymous) @ VM3698:1
var oo =eval(obj)
VM3724:1 Uncaught SyntaxError: Unexpected token :
at <anonymous>:1:14
(anonymous) @ VM3723:1
obj
"{'id': 16, 'name': '管理员', 'delflag': False, 'grade': 1000000.0}"
typeof obj
"string"
obj ={'id': 16, 'name': '管理员', 'delflag': False, 'grade': 1000000.0}
VM3755:1 Uncaught ReferenceError: False is not defined
at <anonymous>:1:43
(anonymous) @ VM3755:1
obj ={'id': 16, 'name': '管理员', 'grade': 1000000.0}
{id: 16, name: "管理员", grade: 1000000}
alert(obj)
undefined
var test =eval("("+obj+")")
VM3847:1 Uncaught SyntaxError: Unexpected identifier
at <anonymous>:1:23
(anonymous) @ VM3846:1
var test =eval("("+"obj"+")")
undefined
typeof test
"object"
alert(test)
undefined

原因是：字典里存储了一个False的变量，js无法识别，SO  报错