我试图循环使用以下内容：
{
"machine": [{
"cost_center": "15023 DC1 M3 - Hassia1",
"item": [{
"batchno": "367721",
"itemno": "12028"
}, {
"batchno": "367722",
"itemno": "12328"
}, {
"batchno": "367723",
"itemno": "12608"
}]
}, {
"cost_center": "15033 DC1 M4 - Hamba",
"item": [{
"batchno": "367729",
"itemno": "11850"
}, {
"batchno": "367730",
"itemno": "11851"
}, {
"batchno": "367731",
"itemno": "11852"
}]
}, {
"cost_center": "15043 DC1 M5 - 1KG Machine",
"item": {
"batchno": "367732",
"itemno": "12592"
}
}]
}
var json = '{"machine":[{"cost_center":"15023 DC1 M3 - Hassia1","item":[{"batchno":"367721","itemno":"12028"},{"batchno":"367722","itemno":"12328"},{"batchno":"367723","itemno":"12608"}]},{"cost_center":"15033 DC1 M4 - Hamba","item":[{"batchno":"367729","itemno":"11850"},{"batchno":"367730","itemno":"11851"},{"batchno":"367731","itemno":"11852"}]},{"cost_center":"15043 DC1 M5 - 1KG Machine","item":{"batchno":"367732","itemno":"12592"}}]}';
var obj = JSON.parse(json);
var db = obj.machine;
for (var m in db) {
if (db.hasOwnProperty(m)) {
var item = db[m].item;
console.log('cost_center ' + m + ' = ' + db[m].cost_center);
for (var i in item) {
if (item.hasOwnProperty(i)) {
var prod = item[i];
console.log('-itemno ' + i + ' ' + prod.itemno);
}
}
}
}
我发现了类似的问题here，但差异在于我的数据，我的前2个cost_centers有数组作为元素，我的第3个不是数组。
cost_center 0 = 15023 DC1 M3 - Hassia1
-itemno 0 12028
-itemno 1 12328
-itemno 2 12608
cost_center 1 = 15033 DC1 M4 - Hamba
-itemno 0 11850
-itemno 1 11851
-itemno 2 11852
cost_center 2 = 15043 DC1 M5 - 1KG机器
-itemno batchno undefined
-itemno itemno undefined
如何循环遍历所有内容并仍然从cost_center中获取不包含数组的所有值？ 感谢
答案 0 :(得分：1)
您可以使用for-in属性，而不是使用forEach循环遍历数组。
另外，如果你的最后一个元素不包含数组，我假设它总是一个对象。因此，要测试它，您可以检查数组的length。如果length存在而不是数组，您可以循环获取答案。如果没有那么它就是一个对象，所以你可以直接打印这些值。
var json = '{"_vger_record_id":"2409247","ExtraData":"","machine":[{"_vger_record_id":"2409248","cost_center":"15023 DC1 M3 - Hassia1","ExtraData":"","item":[{"_vger_record_id":"2409249","batchno":"367721","itemno":"12028"},{"_vger_record_id":"2409250","batchno":"367722","itemno":"12328"},{"_vger_record_id":"2409251","batchno":"367723","itemno":"12608"}]},{"_vger_record_id":"2409257","cost_center":"15033 DC1 M4 - Hamba","ExtraData":"","item":[{"_vger_record_id":"2409258","batchno":"367729","itemno":"11850"},{"_vger_record_id":"2409259","batchno":"367730","itemno":"11851"},{"_vger_record_id":"2409260","batchno":"367731","itemno":"11852"}]},{"_vger_record_id":"2409261","cost_center":"15043 DC1 M5 - 1KG Machine","ExtraData":"","item":{"_vger_record_id":"2409262","batchno":"367732","itemno":"12592"}}]}';
var obj = JSON.parse(json);
var db = obj.machine;
db.forEach(function(m) {
console.log('cost_center = ' + m.cost_center);
if(m.item.length) {
m.item.forEach(function(i) {
console.log('-itemno = ' + i.itemno);
});
} else {
console.log('-itemno = ' + m.item.itemno);
}
});
答案 1 :(得分：1)
无需item.constructor === Array，var db = JSON.parse('{"machine":[{"cost_center":"15023 DC1 M3 - Hassia1","item":[{"batchno":"367721","itemno":"12028"},{"batchno":"367722","itemno":"12328"},{"batchno":"367723","itemno":"12608"}]},{"cost_center":"15033 DC1 M4 - Hamba","item":[{"batchno":"367729","itemno":"11850"},{"batchno":"367730","itemno":"11851"},{"batchno":"367731","itemno":"11852"}]},{"cost_center":"15043 DC1 M5 - 1KG Machine","item":{"batchno":"367732","itemno":"12592"}}]}').machine;
for (var m = 0; m < db.length; m++)
{
var e = db[m], item = e.item;
console.log('cost_center ' + m + ' = ' + e.cost_center);
if (item.constructor === Array)
for (var i = 0; i < item.length; i++)
console.log(' itemno ' + i + ' = ' + item[i].itemno);
else
console.log(' itemno 0 = ' + item.itemno);
}可用于检查：
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