NodeList.length - Web APIs 编辑

The NodeList.length property returns the number of items in a NodeList.

Syntax

numItems = nodeList.length

• numItems is an integer value representing the number of items in a NodeList.

Example

The length property is often useful in DOM programming. It's often used to test the length of a list, to see if it exists at all. It's also commonly used as the iterator in a for loop, as in this example.

// All the paragraphs in the document
var items = document.getElementsByTagName("p");

// For each item in the list,
// append the entire element as a string of HTML
var gross = "";
for (var i = 0; i < items.length; i++) {
  gross += items[i].innerHTML;
}

// gross is now all the HTML for the paragraphs

Specifications

Browser compatibility

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