Element.getAttributeNames() - Web APIs 编辑

The getAttributeNames() method of the Element interface returns the attribute names of the element as an Array of strings. If the element has no attributes it returns an empty array.

Using getAttributeNames() along with getAttribute(), is a memory-efficient and performant alternative to accessing Element.attributes.

Syntax

let attributeNames = element.getAttributeNames();

Example

// Iterate over element's attributes
for (let name of element.getAttributeNames()) {
  let value = element.getAttribute(name);
  console.log(name, value);
}

Polyfill

if (Element.prototype.getAttributeNames == undefined) {
  Element.prototype.getAttributeNames = function () {
    var attributes = this.attributes;
    var length = attributes.length;
    var result = new Array(length);
    for (var i = 0; i < length; i++) {
      result[i] = attributes[i].name;
    }
    return result;
  };
}

Specifications

Browser compatibility

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