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修改以下代码,使得最后⼀⾏代码能够输出数字 0-9(最好能给多种答案) #328

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lgwebdream opened this issue Jul 6, 2020 · 2 comments
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JavaScript teach_tag 新东方 company 编程题 teach_tag

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@lgwebdream
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var arrys = [];
for (var i = 0; i < 10; i++) {
  arrys.push(function () {
    return i;
  });
}
arrys.forEach(function (fn) {
  console.log(fn());
}); //本⾏不能修改
@lgwebdream lgwebdream added JavaScript teach_tag 新东方 company 编程题 teach_tag labels Jul 6, 2020
@lgwebdream
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扫描下方二维码,获取答案以及详细解析,同时可解锁800+道前端面试题。

@GolderBrother
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var arrys = [];
for (var i = 0; i < 10; i++) {
  (function(_i){
    arrys.push(function () {
      return _i;
    });
  })(i);
}
arrys.forEach(function (fn) {
  console.log(fn());
}); //本⾏不能修改

// 方法二:let块级作用域
var arrys = [];
for (let i = 0; i < 10; i++) {
  arrys.push(function () {
    return i;
  });
}
arrys.forEach(function (fn) {
  console.log(fn());
}); //本⾏不能修改

// 方法三
var arrys = [];
for (var i = 0; i < 10; i++) {
  arrys.push((function (_i) {
    return () => _i
  }(i)));
}
arrys.forEach(function (fn) {
  console.log(fn());
}); //本⾏不能修改

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Labels
JavaScript teach_tag 新东方 company 编程题 teach_tag
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