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HTML DOM 元素 before() 方法
tryjsref_element_before3
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<!DOCTYPE html> <html> <body> <h1>The Element Object</h1> <h2>The before() Method</h2> <div id="myDiv">Hello</div> <p>Click to insert two elements and a text before the div:</p> <button onclick="myFunction()">Click here</button> <script> function myFunction() { const div = document.getElementById("myDiv"); const h3 = document.createElement("h3"); const h4 = document.createElement("h4"); div.before(h3, h4, "Some text!"); h3.append("Hello! I am an h3"); h4.append("Hello! I am an h4"); } </script> </body> </html>