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<!DOCTYPE html> <html> <body> <h1>JavaScript 数组方法</h1> <h2>unshift()</h2> <p>unshift() 方法将新元素添加到数组的开头。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> var fruits = ["Banana", "Orange", "Apple", "Mango"]; document.getElementById("demo").innerHTML = fruits; function myFunction() { fruits.unshift("Lemon"); document.getElementById("demo").innerHTML = fruits; } </script> </body> </html>