[英]Array.push updates itself while using inside map function
Here I have used two new arrays for catching URL and Filename value.在这里,我使用了两个新的 arrays 来捕获 URL 和 Filename 值。 When I view it on console I got different values everytime like array got overwritten from previous values, Am I doing anything wrong?当我在控制台上查看它时,每次都会得到不同的值,比如数组被以前的值覆盖,我做错了什么吗?
downLoadFilesAsZip = async(item) => {
for (const index in item.docLinks) {
let urlArr=[];
let fileNameArr = [];
const url = item.docLinks[index];
let linkParts = url.split("?");
let filename = linkParts[0].substring(linkParts[0].lastIndexOf('/')+1);
urlArr.push(url);
fileNameArr.push(filename);
}
}
downLoadAllAsZip = () => {
{
this.state.docGroups.length !== 0 && this.state.docGroups.map((item) => {
if(item.docLinks !== null && item.docLinks.length > 0){
return(
this.downLoadFilesAsZip(item)
);
}
})
}
}
Follow the loop.跟随循环。 Every time your loop runs you are setting empty arrays.每次循环运行时,您都会设置空 arrays。
let urlArr=[];
let fileNameArr = [];
bring that outside of your for loop.把它带到你的 for 循环之外。
Declaring array outside for loop(after import) helped to update every values, For.tsx file answer was this在 for 循环外声明数组(导入后)有助于更新每个值,For.tsx 文件的答案是这样
type urlArr = any[];
type fileNameArr = any[];
let urlArr=[];
let fileNameArr = [];
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