Question

我是javaScript的新手。我已经了解了如何使用JSON.Parse（）从JSON文件创建对象，现在我需要将多个本地JSON加载到数组中。我一直在谷歌搜索我的问题，但我找到的所有内容都与单个文件有关。有没有办法在没有jQuery等任何库的纯JS中做到这一点？

P.S。：无需使用Web服务器，或者代码在本地运行。

Answer 1

要执行此操作，您需要先获取实际文件。然后，你应该解析它们。

// we need a function to load files
// done is a "callback" function
// so you call it once you're finished and pass whatever you want
// in this case, we're passing the `responseText` of the XML request
var loadFile = function (filePath, done) {
    var xhr = new XMLHTTPRequest();
    xhr.onload = function () { return done(this.responseText) }
    xhr.open("GET", filePath, true);
    xhr.send();
}
// paths to all of your files
var myFiles = [ "file1", "file2", "file3" ];
// where you want to store the data
var jsonData = [];
// loop through each file
myFiles.forEach(function (file, i) {
    // and call loadFile
    // note how a function is passed as the second parameter
    // that's the callback function
    loadFile(file, function (responseText) {
        // we set jsonData[i] to the parse data since the requests
        // will not necessarily come in order
        // so we can't use JSONdata.push(JSON.parse(responseText));
        // if the order doesn't matter, you can use push
        jsonData[i] = JSON.parse(responseText);
        // or you could choose not to store it in an array.
        // whatever you decide to do with it, it is available as
        // responseText within this scope (unparsed!)
    }
})

如果您无法发出XML请求，您还可以使用文件读取器对象：

var loadLocalFile = function (filePath, done) {
    var fr = new FileReader();
    fr.onload = function () { return done(this.result); }
    fr.readAsText(filePath);
}

Answer 2

以下伪代码段可能会对您有所帮助 -

var myArray = [];
for(... loop through your files ...) {
    myArray.push(JSON.parse(your_file);
}

Answer 3

您可以这样做：

var file1 = JSON.parse(file1);
var file2 = JSON.parse(file2);
var file3 = JSON.parse(file3);
var myFileArray = [file1, file2, file3];
// Do other stuff
// ....
// Add another file to the array
var file4 = JSON.parse(file4);
myFileArray.push(file4);

如果您已经有一系列未解析的文件，您可以这样做：

var myFileArray = [];
for(var i=0; i<unparsedFileArray.length; i++){
    myFileArray.push(JON.parse(unparsedFileArray[i]));
}

在纯JavaScript中加载多个JSON文件

3 个答案: