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Today Xiaobian to share with you how to use javascript object to delete an attribute of the relevant knowledge points, detailed content, clear logic, I believe that most people are too aware of this knowledge, so share this article for your reference, I hope you will learn something after reading this article, let's take a look at it.

In javascript, you can use the delete operator to delete the properties of an object in the syntax format "delete object. Property name;". When an object property is deleted, instead of setting the property value to undefined, the property is completely purged from the object.

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

In javascript, objects are referential, composite data; object properties are also known as name-value pairs, including attribute names and attribute values. The property name can be any string that contains an empty string, and there cannot be two properties with the same name in an object. Property values can be any type of data.

Delete attribut

Use the delete operator to delete the properties of an object.

Example 1

The following example uses the delete operator to delete the specified property.

Var obj = {x: 1, y: 2, z: 3}; / / define the object delete obj.x; / / delete the properties of the object xconsole.log (obj.x); / / return undefinedconsole.log (obj)

Output:

When an object property is deleted, instead of setting the property value to undefined, the property is completely purged from the object. If you use the for/in statement to enumerate object properties, you can only enumerate properties whose value is undefined, but not deleted attributes.

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