使用JS中的点运算符从字符串数组中使用键访问JSON对象无法正常工作[重复]
问题描述：
This question already has an answer here:
The JSON object I got was from another PHP file that is called through $.ajax(). For example, I returned from my PHP file a echo json_encode(array('a' => 'b')).
Then, I have the following $.ajax() code:
let objKey = ['a'];
$.ajax({
type : 'POST',
url : 'phpfilehere.php',
dataType : 'json',
success : function(obj) {
alert(obj.objKey[0]);
}
});It should have alerted b instead of undefined. Then, I tried alert(obj.a) and it worked. It alerted b. How do I access the value of the JSON object with an array of string which all corresponds to the key of said JSON object?
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答
obj.objKey[0] is false in your case, it's good if your object is like :
obj = { 'objKey': ['b'] }
You have two solutions in your case
alert(obj[objKey[0]]);
or
alert(obj.a);
Reference
答
I think this should be like: alert(obj[objKey][0]).