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Element.hasAttribute() - Web APIs 编辑

The Element.hasAttribute() method returns a Boolean value indicating whether the specified element has the specified attribute or not.

Syntax

var result = element.hasAttribute(name);

result: holds the return value true or false.
name: is a string representing the name of the attribute.

Example

var foo = document.getElementById("foo");
if (foo.hasAttribute("bar")) {
    // do something
}

Polyfill

;(function(prototype) {
    prototype.hasAttribute = prototype.hasAttribute || function(name) {
        return !!(this.attributes[name] &&
                  this.attributes[name].specified);
    }
})(Element.prototype);

Notes

DOM methods dealing with element's attributes:

Not namespace-aware, most commonly used methods	Namespace-aware variants (DOM Level 2)	DOM Level 1 methods for dealing with `Attr` nodes directly (seldom used)	DOM Level 2 namespace-aware methods for dealing with `Attr` nodes directly (seldom used)
`setAttribute` (DOM 1)	`setAttributeNS`	`setAttributeNode`	`setAttributeNodeNS`
`getAttribute` (DOM 1)	`getAttributeNS`	`getAttributeNode`	`getAttributeNodeNS`
`hasAttribute` (DOM 2)	`hasAttributeNS`	-	-
`removeAttribute` (DOM 1)	`removeAttributeNS`	`removeAttributeNode`	-

Specifications

Specification	Status	Comment
DOM The definition of 'Element.hasAttribute()' in that specification.	Living Standard	From Document Object Model (DOM) Level 3 Core Specification, moved from `Node` to `Element`
Document Object Model (DOM) Level 3 Core Specification The definition of 'Element.hasAttribute()' in that specification.	Obsolete	No change from Document Object Model (DOM) Level 2 Core Specification
Document Object Model (DOM) Level 2 Core Specification The definition of 'Element.hasAttribute()' in that specification.	Obsolete	Initial definition.