o = {a:1,o:{b:2,f : function(){alert(o.a);//1alert(o.b);//undefined
}}
}
o.o.f();o = {a:7,o : {a:1,o:{b:2,f : function(){alert(o.a);//7alert(o.b);//undefined
}}}
}
o.o.o.f();o = {//这个o加到window闭包里面去了a:7,o : {//这个o没有a:1,o:{//这个o没有b:2,f : function(){alert(o.a);//7alert(o.b);//undefined
}}}
}
o.o.o.f();f = function(){return {a:1,o:{b:2,f : function(){alert(o.a);//o is not defined ,说明o不存在alert(o.b);//o is not defined ,说明o不存在
}}}
}
f().o.f();f = function(){o = {a:7,b:8}return {a:1,o:{b:2,f : function(){alert(o.a);//7alert(o.b);//8 return的东西不在闭包里面
}}}
}
f().o.f();f = function(){o= {//这个o加到函数闭包里面去了a:1,o:{//这个o没有b:2,f : function(){alert(o.a);//1alert(o.b);//undefined
}}}return o;
}
f().o.f();f = function(){return {a:1,o:{b:2,f : function(){o = {a:3,b:4}alert(o.a);//3alert(o.b);//4
}}}
}
f().o.f();f = function(){o = {a:5,b:6}return function(){a=1,o={b:2,f : function(){alert(o.a);//unudefined 以函数作为闭包层级,一层一层的向上查找,找到了就不找了alert(o.b);//2
}}return o;}
}
f()().f();f = function(){o = {a:5,b:6}return function(){a=1,b={b:2,f : function(){alert(o.a);//5alert(o.b);//6
}}return b;}
}
f()().f();
f = function(){return function(){o = {a:15,b:16}//加到闭包a=1,b={//加到闭包o:{a:11,b:12}, //没有加到闭包b:2,f : function(){alert(o.a);//15alert(o.b);//16
}}return b;}
}
f()().f();