Js Code for Traversing Object Attributes

For example:
Copy codeThe Code is as follows:
Function. prototype. addMethod = function (methodName, func ){
If (! This. prototype [methodName]) {
This. prototype [methodName] = func; // Add a method to the prototype, which affects the type of instances.
}
Return this. prototype; // return the prototype. this type of instance can be called in a chain.
}
Function CustomObject (name, value ){
This. name = name | 'customobject ';
This. value = value | 0;
This. toString = function (){
Return '[name:' + this. name + ', value:' + this. value + ']'
}
}
CustomObject. addMethod ('testfun', function (){})
Var obj = new CustomObject ();
Var info = '';
For (var property in obj ){
Info + = property + "| ";
}
Alert (info); // name | value | toString | testFun |

However, for in also traverses the attributes of the object inherited from the prototype object. To remove the inherited attributes, use the hasOwnProperty statement. For example
Copy codeThe Code is as follows:
Function. prototype. addMethod = function (methodName, func ){
If (! This. prototype [methodName]) {
This. prototype [methodName] = func; // Add a method to the prototype, which affects the type of instances.
}
Return this. prototype; // return the prototype. this type of instance can be called in a chain.
}
Function CustomObject (name, value ){
This. name = name | 'customobject ';
This. value = value | 0;
This. toString = function (){
Return '[name:' + this. name + ', value:' + this. value + ']'
}
}
CustomObject. addMethod ('testfun', function (){})
Var obj = new CustomObject ();
Var info = '';
For (var property in obj ){
If (! Obj. hasOwnProperty (property) continue;
Info + = property + "| ";
}
Alert (info); // name | value | toString |