var globalVar = "abc";
var x = { foo : 1};
var y = {bar : "hello"}
(function() {
delete x.foo;
console.log(x.foo);
delete globalVar;
console.log(glovalVar);
var yobj = Object.create(y);
delete yobj.x;
console.log(yobj.x);
})(); 请打出输出的信息

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