IE 问题 - 不支持 Object.keys(value).length

问题描述

我一直在尝试在 Internet Explorer 中调试一些 js，但我无法弄清楚这一点.这是导致错误的行:

I've been trying to debug some js in Internet Explorer, and I can't figure this one out. Here's the line that is causing the error:

var numberOfColumns = Object.keys(value).length;

错误是...

Message: Object doesn't support this property or method
Line: 640
Char: 5
Code: 0
URI: xxx

起初我认为它与 Object.keys(value).length; 属性有关，但奇怪的是(无论如何对我来说)，错误在字符 5，这是变量名的开头.

At first I thought it had something to do with the Object.keys(value).length; property, but strangely (for me anyways), the error is at char 5, which is the beginning of the variable name.

无论如何，我不知道发生了什么或如何解决它.另外，如果我替换:

Anyways, I have no idea what's going on or how to fix it. Also, if I replace:

var numberOfColumns = Object.keys(value).length;

随着...

var numberOfColumns = 9; // troubleshooting

错误仍然存​​在.请帮忙.

The error persists. Please help.

更新

jsFiddle 添加了

jsFiddle added

http://jsfiddle.net/4Rab7/

推荐答案

keys 属性在 IE >= 9 中受支持.您可能正在早期版本中测试它.一个简单的解决方法是:

The keys property is supported in IE >= 9. You are probably testing it in an earlier version. A simple workaround is:

var length = 0;
for(var prop in data){
    if(data.hasOwnProperty(prop))
        length++;
}

这是一个演示:http://jsfiddle.net/vKr8a/

有关详细信息，请参阅此兼容性表:

See this compatibility table for more info:

http://kangax.github.com/es5-compat-table/

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