javascript - 如何JSON解析多元素数组？

Question

试图从 PHP 中获取数据。我正在使用 url 来显示图像，然后我正在使用标签来重新排序我试图创建称为数据的数组。我不确定我是否正确解析。

var data = [];

function importJson(str) {

    if (str == "") {
        document.getElementById("content").innerHTML = "";
        return;
    }
    if (window.XMLHttpRequest) {
        // code for IE7+, Firefox, Chrome, Opera, Safari
        xmlhttp = new XMLHttpRequest();
    } else { // code for IE6, IE5
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }


    xmlhttp.onreadystatechange = function() {

        if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {

            data = JSON.parse(xmlhttp.response);
            alert(xmlhttp.response);
            alert(data);

            for (var sport_index = 0; sport_index < data.sport.length; sport_index++) {
                var url1 = data.sport[sport_index][1];
                alert(data.sport);
            }
            alert(url1);
        }
    }

    xmlhttp.open("GET", "http://server/~name/folder/many.php");
    xmlhttp.responseType = "json";
    xmlhttp.send();

    function buildImage(imagesrc) {
        var img = document.createElement('img');
        img.src = imagesrc;
        document.getElementById('content').appendChild(img);
    }

}

xmlhttp.response 看起来像这样

{"sport":[{"ImagesId":"34","ImagesPath":"http:\/\/server\/~name\/folder\/images\/24-08-2014-1408868419.png","Tag":"sport"},{"ImagesId":"30","ImagesPath":"http:\/\/server\/~name\/folder\/images\/23-08-2014-1408824125.png","Tag":"sport"}],"clothes":[{"ImagesId":"33","ImagesPath":"http:\/\/server\/~name\/folder\/images\/23-08-2014-1408824179.png","Tag":"clothes"},{"ImagesId":"32","ImagesPath":"http:\/\/server\/~name\/folder\/images\/23-08-2014-1408824166.png","Tag":"clothes"}],"food":[{"ImagesId":"31","ImagesPath":"http:\/\/server\/~name\/folder\/images\/23-08-2014-1408824158.png","Tag":"food"}]} 

但数据看起来像 [object Object]，当我尝试使用 url 来创建图像时，元素是未定义的。

Answer 1

在 Javascript 对象中，您可以通过名称访问元素，例如:

data.sport[sport_index]["ImagesPath"]

或者

data.sport[sport_index].ImagesPath