-
-
Save alexmaday/ae7859c6b290bdb2fe2859b4a3a53bf5 to your computer and use it in GitHub Desktop.
The operation consists to append 12 nodes to an existing parent node with 1000 children Three ways to do it:
1. Use parentNode.innerHTML += 2. User parentNode.innerHTML = 3. Use a parentNode.appendChild inside a loop. The method with the best performance is the last one. The last method doesn't need to read the current DOM or parse it.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| var mainNodeInner = document.createElement('div'), | |
| mainNodeInnerPlus = document.createElement('div'), | |
| mainNodeAppend = document.createElement('div'), | |
| sampleHTML = '<div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div>', | |
| testHTML = '', | |
| numSamples = 1000, | |
| before = null, | |
| after = null; | |
| //SET UP | |
| for (i = 0; i < numSamples; i++) { | |
| testHTML += sampleHTML; | |
| } | |
| //INNER HTML += | |
| mainNodeInnerPlus.innerHTML = testHTML; | |
| before = new Date().getTime(); | |
| mainNodeInnerPlus.innerHTML += sampleHTML; | |
| after = new Date().getTime(); | |
| console.log("TIME INNER HTML +=: " + (after - before) + " ms"); | |
| console.log("Num childs after: " + mainNodeInnerPlus.childElementCount); | |
| console.log(' '); | |
| //INNER HTML = | |
| var allHTML = testHTML + sampleHTML; | |
| before = new Date().getTime(); | |
| mainNodeInner.innerHTML = allHTML; | |
| after = new Date().getTime(); | |
| console.log("TIME INNER HTML =: " + (after - before) + " ms"); | |
| console.log("Num childs after: " + mainNodeInner.childElementCount); | |
| console.log(' '); | |
| //APPEND CHILD | |
| mainNodeAppend.innerHTML = testHTML; | |
| before = new Date().getTime(); | |
| var sampleNode = document.createElement('div'); | |
| sampleNode.innerHTML = sampleHTML; | |
| while(sampleNode.hasChildNodes()) { | |
| mainNodeAppend.appendChild(sampleNode.firstChild); | |
| } | |
| after = new Date().getTime(); | |
| console.log("TIME APPEND CHILD: " + (after - before) + " ms"); | |
| console.log("Num childs after: " + mainNodeAppend.childElementCount); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment