Array的console.log在IE 10,11中返回函数item（）{[native code]} [英] console.log of Array returns function item() { [native code] } in IE 10,11

问题描述

我正在尝试调试IE ajax问题。我收集并存储在数组中的数据称为eachItem。然后使用eachItem.join（’）将其转换为字符串。但是在执行此步骤之前，我先进行console.log数组，然后IE 10和11返回

I am trying to debug an IE ajax issue. The data I collect in and store in an array call eachItem. It is then converted to a string using eachItem.join(''). But before it even makes it to this step I console.log the array and IE 10 and 11 return

 function item() {
   [native code]
 }

eachItem.length的console.log返回1。但是我看不到内容。稍后，我通过ajax推送此数据，并得到一个空数组。但是我试图首先从这里开始，以了解为什么IE似乎无法读取我的数组。

A console.log of eachItem.length returns 1. But I can't see the contents. I later am pushing this data over ajax and getting an empty array. But I was trying to start here first to see why IE doesn't seem to read my array.

推荐答案

Internet Explorer（11）具有一个名为 item 的全局函数。是只读的。在 item = foo 之后， item.toString（）仍然显示

Internet Explorer (11) has a global function called item which is read only. After item="foo", item.toString() still shows

function item() {
    [native code]
} 

但是可以重新声明。在 var item = foo 之后， item.toString（）显示

However it can be redeclared. After var item = foo, item.toString() shows

`foo`

使用<$小提琴代码中的c $ c> item 找到

item = serviceTitleRow + eachService + trip_charge;

在第98行，而无需事先声明。我建议在使用前声明 item 可能会解决此问题。

at line 98 without previous declaration. I suggest declaring item before use will likely fix the problem.

FWIW ，Javascript严格模式将对未声明变量的赋值视为错误，并在大多数情况下捕获此错误。由于函数名称标识符没有用于变量标识符的单独名称空间，因此允许重新分配函数名称的值。但是，IE中的严格模式在尝试更新 item 的值时会引发不同的分配只读属性错误，因此严格模式可能有助于捕获此错误。

FWIW, Javascript strict mode treats assignment to an undeclared variable as an error and catches this error most of the time. Because function name identifiers don't have a separated name space to variable identifers, reassigning the value of a function name is allowed. However, strict mode in IE throws a different "assignment to read only property not allowed" error when trying to update the value of item, so strict mode may have helped catch this error earlier in multiple browsers.

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