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November 7, 2019 15:33
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Ch14-exercise-Element By Tag Name</title> | |
| </head> | |
| <body> | |
| <h1>Heading with a <span>span</span> element.</h1> | |
| <p>A paragraph with <span>one</span>, <span>two</span> spans.</p> | |
| <script> | |
| function byTagName(node, tagName) { | |
| let array = []; | |
| function searchForNode(node){ | |
| for(let i = 0; i < node.childNodes.length; i++){ | |
| let child = node.childNodes[i]; | |
| if(child.nodeType == document.ELEMENT_NODE){ | |
| if(child.nodeName.toLowerCase() == tagName){ | |
| array.push(child); | |
| } | |
| } | |
| searchForNode(child); | |
| } | |
| } | |
| searchForNode(node); | |
| return array; | |
| } | |
| console.log(byTagName(document.body, "h1").length); | |
| // → 1 | |
| console.log(byTagName(document.body, "span").length); | |
| // → 3 | |
| let para = document.querySelector("p"); | |
| console.log(byTagName(para, "span").length); | |
| // → 2 | |
| </script> | |
| </body> | |
| </html> |
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