javascript 如何使用javascript从json数组中获取值？
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How to get values from json array using javascript?
提问by harrison4
I have a PHP file which only return an array with the drivers and a url:
我有一个 PHP 文件，它只返回一个包含驱动程序和 url 的数组：
{"drivers":[{"marco":[0],"luigi":[123],"Joan":[2444],"George":[25]}, {"marco":[23],"luigi":[3],"Joan":[244],"George":[234]}],"url":"google.es"}
Is the json correctly structured? And I'm trying to get the result using jQuery and AJAX by this way:
json 的结构是否正确？我试图通过这种方式使用 jQuery 和 AJAX 获得结果：
$.getJSON('calculate.php&someparams=123', function(data) {
alert("url - " + data.url);
var arr = data.drivers;
for (var i = 0; i < arr.length; i++) {
alert(arr[i] + " - " + arr[i][0]);
}
});
I see the first alert() with the url, but the second one does not works... What am I doing wrong?
我看到第一个带有 url 的 alert()，但第二个不起作用......我做错了什么？
If you need more info let me know and I'll edit the post.
如果您需要更多信息，请告诉我，我会编辑帖子。
回答by Arun P Johny
The driversis not an array, it is an object, you use $.eachto iterate through the object elements.
这drivers不是一个数组，它是一个对象，你使用$.each来遍历对象元素。
$.getJSON('calculate.php&someparams=123', function(data) {
$.each(data.drivers, function(key, value){
$.each(value, function(key, value){
console.log(key, value);
});
})
});
回答by jeyraof
driversis an object. Not an array.
drivers是一个对象。不是数组。
How about this?
这个怎么样？
var json_string = '{"drivers":{"marco":[0],"luigi":[123],"Joan":[2444],"George":[25]},"url":"google.es"}';
var obj = jQuery.parseJSON(json_string);
alert(obj.url);
回答by Quentin
That's an object, not an array. It has named properties, not numerical indexes.
那是一个对象，而不是一个数组。它具有命名属性，而不是数字索引。
You need a for in loopto loop over the properties.
您需要一个for in 循环来遍历属性。
