Access and traversal of JavaScript objects

The slave server returns a JSON string with the following content:

var str = [{"id":"328482","user_id":"54","time":"1320214671"},{"id":"328283","user_id":"43","time":"1320046877"},{"id":"327075","user_id":"43","time":"1318740675"},{"id":"326153","user_id":"60","time":"1318144953"}]

Remote links can be referenced in this way. This JSON is an object.

<script src="http://www.bkjia.com/json.php" type="text/javascript"></script>

How can I traverse this JSON object? You can search for a method from the Internet.

Function allPrpos (obj) {// used to save all attribute names and values var props = ""; // start traversing for (var p in obj) {// method if (typeof (obj [p]) = "function") {obj [p] ();} else {// p is the attribute name, obj [p] is the value of the corresponding property props + = p + "=" + obj [p] + "";}} // display all attributes // alert (props); // document. getElementById ("shows "). innerHTML = props ;}

The traversal result is as follows:

0=[object Object] 1=[object Object] 2=[object Object] 3=[object Object] 

You can access the property of an object in this way: str [0] ["id"], because the object is also an object.

There are two methods to directly access the value of property a of object obj:

• Obj.
• Obj ["a"]

However, if you use the for/in statement to access the object's property value, you must use the "[]" OPERATOR:

For (m in obj) {alert (obj [m]); alert (obj. m); // undefined} is displayed here}

Why? Because the for/in loop assigns the property name of the object to the variable m as a string.

The javascript array is just a special object, so:

Var arr = new Array (); arr [0] = 10; arr ['a'] = 20; for (m in arr) {alert (m ); // pop up 0 and a alert (arr [m]); // pop up 10 and 20}