獲取 TypeError：在嚴格模式下可能無法訪問“caller”、“callee”和“arguments”屬性

Question

我有以下 jQuery 代碼：

$(document).ready(function() {

  $('.btn-create-post-card').on('click', function(event) {
    event.preventDefault();
    let form_data = new FormData(),
      file = $('.input_file_button');
    // if(!file.val()) {
    //     alert('Please select postcard you want to send')
    // }
    form_data.append("file", file.prop('files')[0]);
    $.ajax({
      url: "/sendEmail",
      dataType: 'multipart/form-data',
      cache: false,
      contentType: false,
      processData: false,
      data: form_data,
      type: 'post',
      success: function(data) {
        alert('OK');
      },
      error: function(error, status) {
        console.log('here');
        console.log(error);
        alert(error);
      }
    });
  });
});

我收到了這個錯誤：

TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them
在 Function.remoteFunction (:2:14)

控制台 output 是：

如您所見，響應成功，我之前多次使用 jQuery AJAX 調用，但從未遇到過此問題。

更新：

控制台 output：

abort: ƒ (e)
    arguments: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    caller: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    length: 1
    name: "abort"
    prototype: {constructor: ƒ}
    __proto__: ƒ ()
    [[FunctionLocation]]: jquery.min.js:2
    [[Scopes]]: Scopes[3]
always: ƒ ()
    arguments: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    caller: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    length: 0
    name: "always"
    prototype: {constructor: ƒ}
    __proto__: ƒ ()
    [[FunctionLocation]]: jquery.min.js:2
    [[Scopes]]: Scopes[3]
catch: ƒ (e)
    arguments: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    caller: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    length: 1
    name: "catch"
    prototype: {constructor: ƒ}
    __proto__: ƒ ()
    [[FunctionLocation]]: jquery.min.js:2
    [[Scopes]]: Scopes[3]
done: ƒ ()
    arguments: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    caller: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    length: 0
    name: "add"
    prototype: {constructor: ƒ}
    __proto__: ƒ ()
    [[FunctionLocation]]: jquery.min.js:2
    [[Scopes]]: Scopes[3]
fail: ƒ ()
    arguments: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    caller: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    length: 0
    name: "add"
    prototype: {constructor: ƒ}
    __proto__: ƒ ()
    [[FunctionLocation]]: jquery.min.js:2
    [[Scopes]]: Scopes[3]
getAllResponseHeaders: ƒ ()
    arguments: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    caller: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    length: 0
    name: "getAllResponseHeaders"
    prototype: {constructor: ƒ}
    __proto__: ƒ ()
    [[FunctionLocation]]: jquery.min.js:2
    [[Scopes]]: Scopes[3]
getResponseHeader: ƒ (e)
    arguments: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    caller: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    length: 1
    name: "getResponseHeader"
    prototype: {constructor: ƒ}
    __proto__: ƒ ()
    [[FunctionLocation]]: jquery.min.js:2
    [[Scopes]]: Scopes[3]
overrideMimeType: ƒ (e)
    arguments: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    caller: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    length: 1
    name: "overrideMimeType"
    prototype: {constructor: ƒ}
    __proto__: ƒ ()
    [[FunctionLocation]]: jquery.min.js:2
    [[Scopes]]: Scopes[3]
pipe: ƒ ()
    arguments: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    caller: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    length: 0
    name: "pipe"
    prototype: {constructor: ƒ}
    __proto__: ƒ ()
    [[FunctionLocation]]: jquery.min.js:2
    [[Scopes]]: Scopes[3]
progress: ƒ ()
    arguments: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    caller: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    length: 0
    name: "add"
    prototype: {constructor: ƒ}
    __proto__: ƒ ()
    [[FunctionLocation]]: jquery.min.js:2
    [[Scopes]]: Scopes[3]
promise: ƒ (e)
    arguments: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    caller: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    length: 1
    name: "promise"
    prototype: {constructor: ƒ}
    __proto__: ƒ ()
    [[FunctionLocation]]: jquery.min.js:2
    [[Scopes]]: Scopes[3]
readyState: 4
responseText: ""can't upload file""
setRequestHeader: ƒ (e,t)
    arguments: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    caller: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    length: 2
    name: "setRequestHeader"
    prototype: {constructor: ƒ}
    __proto__: ƒ ()
    [[FunctionLocation]]: jquery.min.js:2
    [[Scopes]]: Scopes[3]
state: ƒ ()
    arguments: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    caller: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    length: 0
    name: "state"
    prototype: {constructor: ƒ}
    __proto__: ƒ ()
    [[FunctionLocation]]: jquery.min.js:2
    [[Scopes]]: Scopes[3]
status: 200
statusCode: ƒ (e)
    arguments: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    caller: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    length: 1
    name: "statusCode"
    prototype: {constructor: ƒ}
    __proto__: ƒ ()
    [[FunctionLocation]]: jquery.min.js:2
    [[Scopes]]: Scopes[3]
statusText: "OK"
then: ƒ (t,r,i)
    arguments: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    caller: [Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction (<anonymous>:2:14)]
    length: 3
    name: "then"
    prototype: {constructor: ƒ}
    __proto__: ƒ ()
    [[FunctionLocation]]: jquery.min.js:2
    [[Scopes]]: Scopes[3]
__proto__: Object

Answer 1

我不認為嚴格模​​式是錯誤，只是控制台無法在嚴格模式下獲取參數數組的內容。 狀態為 200，因此看起來 ajax 調用有效，但響應文本顯示“無法上傳文件”，因此我認為錯誤出在服務器端。

更新 TypeError 示例：

TypeError 只是說控制台在使用嚴格模式時無法獲取參數數組的值。 這不是代碼錯誤。 圖像中的簡單示例演示了這一點。

Answer 2

我發現了問題：它在dataType: 'multipart/form-data' ，在我刪除它后，一切正常。

我認為它可以在另一台機器上運行，因為該機器上的瀏覽器版本不支持strict mode 。

Answer 3

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/caller ：

如果頂層代碼調用了function f，則f.caller的值為null； 否則就是調用 f 的 function。 如果調用f的function是嚴格模式function，那么f.caller的值也是null。

在嚴格模式下，訪問 function 的調用者會引發錯誤。 這是為了防止 function 能夠“遍歷堆棧”，這既會帶來安全風險，又會嚴重限制內聯和尾調用優化等優化的可能性。 有關更多解釋，您可以閱讀棄用 arguments.callee 的基本原理。

請注意，ECMAScript 規范指定的唯一行為是 Function.prototype 有一個初始調用者訪問器，它無條件地為任何 get 或 set 請求拋出 TypeError（稱為“毒丸訪問器”），並且實現不允許更改此語義適用於任何 function，非嚴格普通函數除外，在這種情況下，它不能具有嚴格模式 function 的值。調用者屬性的實際行為（如果不是拋出錯誤）是實現定義的。 例如，Chrome 將其定義為自己的數據屬性，而 Firefox 和 Safari 擴展了初始毒丸訪問器 Function.prototype.caller 以專門處理這些非嚴格函數的值。