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<!DOCTYPE html> <html> <body> <h2>JavaScript 数组方法</h2> <p>删除元素会在数组中留下未定义的空洞。</p> <p id="demo1"></p> <p id="demo2"></p> <script> var fruits = ["香蕉","橙子","苹果","芒果"]; document.getElementById("demo1").innerHTML = "第一个水果是：" + fruits[0]; delete fruits[0]; document.getElementById("demo2").innerHTML = "第一个水果是：" + fruits[0]; </script> </body> </html>