Javascript比较2检查localStorage [英] Javascript comparing 2 checks for localStorage

问题描述

我在diveintohtml5网站上看到这个。这是他们如何检查浏览器是否支持localstorage。

I saw this in the diveintohtml5 website. This is how they check to see if localstorage is supported on the browser.

返回'localStorage'在窗口& window ['localStorage']！== null;

这和以前一样吗？

return window.localStorage！= undefined

推荐答案

p> 1

return 'localStorage' in window && window['localStorage'] !== null;

如果窗口对象包含名为 localStorage 的属性，并且该属性的值不是 null 。

This returns true if the window object contains a property with the name localStorage and the value of that property is not null.

2

return window.localStorage != undefined

如果 code> object包含名为 localStorage 的属性，并且该属性的值不是 undefined 或 null
（假设全局属性 undefined 保存值 undefined ）

This returns true if the window object contains a propety with the name localStorage and the value of that property is not undefined or null (I am assuming that the global property undefined holds the value undefined)

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