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Liqiuyue9597 avatar Liqiuyue9597 commented on May 29, 2024

这道题考察的是变量提升中,函数是一等公民

var temp = 1;
function test() {
  temp = 10;
  return;
  function temp() {}
}
test();
console.log(temp);

temp的输出结果是1。
分析:因为在test函数里,function temp() {}首先被函数声明提升,此时temp = function (){} (类似于temp变量在函数内部被声明了),然后再执行语句 temp=10,相当于此时temp=10修改的是test函数作用域里的temp,没有修改外面的temp。所以在全局变量作用域里输出时输出的是全部变量temp,此时为1

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