JSON.parse 解析json 上有問題嗎 ？？
代碼 ： var old_m, new_m, oldArr, newArr;
console.log("TEST A");
old_m = '[{"date":"20-06 11:23:01","_id":"51c2759fa828f0920b000005"}]'; oldArr = JSON.parse( old_m );
new_m = '{"date":"20-06 11:23:01","_id":"51c2759fa828f0920b000005"}'; newArr = JSON.parse( new_m );
console.log("old_text:" + old_m ); console.log("old Arr:" + oldArr.date );
console.log("new_text:" + new_m ); console.log("new Arr:" + newArr.date );
console.log("TEST B");
old_m = '[{"date":"20-06 11:23:01","_id":"51c2759fa828f0920b000005"},{"date":"20-06 11:23:01","_id":"51c2759fa828f0920b000005"}]'; oldArr = JSON.parse( old_m );
new_m = '{"date":"20-06 11:23:01","_id":"51c2759fa828f0920b000005"},{"date":"20-06 11:23:01","_id":"51c2759fa828f0920b000005"}'; newArr = JSON.parse( new_m );
console.log("old_text:" + old_m ); console.log("old Arr:" + oldArr.date );
console.log("new_text:" + new_m ); console.log("new Arr:" + newArr.date );
============================== OUTPUT :
TEST A
old_text:[{"date":"20-06 11:23:01","_id":"51c2759fa828f0920b000005"}] old Arr:undefined
new_text:{"date":"20-06 11:23:01","_id":"51c2759fa828f0920b000005"} new Arr:20-06 11:23:01
TEST B
old_text:[{"date":"20-06 11:23:01","_id":"51c2759fa828f0920b000005"},{"date":"20-06 11:23:01","_id":"51c2759fa828f0920b000005"}] old Arr:undefined
new_text:{"date":"20-06 11:23:01","_id":"51c2759fa828f0920b000005"},{"date":"20-06 11:23:01","_id":"51c2759fa828f0920b000005"} new Arr: 已死
回复 (4)
你要搞清楚json后是对象还是数组，要是数组就[]括起来，要是对象就用对象定义。
[{"date":"20-06 11:23:01","_id":"51c2759fa828f0920b000005"},{"date":"20-06 11:23:01","_id":"51c2759fa828f0920b000005"}] old Arr:undefined
即是數組用 oldArr.length , 再 for loop 吧
这代码看起来好乱
哦 ， test 代碼没有寫得很好 ， 見諒 因為我習慣了 php print_r display 所有 array
Nodejs 的做法應該是
var text = '[{"date":"20-06 11:23:01","_id":"51c2759fa828f0920b000005"}]'; var arr = JSON.parse( text );
console.log("Date:" + arr[0].date );