var x = function (){};
var x = function y(){};
console.log(y)//报错y未定义
function x() {};
var x = function (){};
x =new Function (){};
x = (x,y) => {x+y}
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function f1(){};
f1.name;// f1
var f2 = function(){};
f2.name; //f2
var f3 = function f4(){};
f3.name; //f4
f5 = new Function (){};
f5.name; //anonymous
