Cannot read properties of undefined (reading 'hasOwnProperty')
时间: 2023-10-12 18:07:55 浏览: 37
这个错误的意思是你试图访问一个未定义的变量的属性。在JavaScript中,hasOwnProperty函数方法是返回一个布尔值,指出一个对象是否具有指定名称的属性。你可以使用typeof运算符检查变量是否已经被定义,然后再使用hasOwnProperty方法来判断该属性是否存在。例如,你可以这样写代码来避免这个错误:
if (typeof myVar !== 'undefined') {
console.log(myVar.hasOwnProperty('foo'));
}
这样可以在访问变量之前先检查变量是否已经被定义,避免出现Cannot read properties of undefined (reading 'hasOwnProperty')这个错误。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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- *2* [浅析hasOwnProperty方法的应用](https://download.csdn.net/download/weixin_38713009/14819073)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
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