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<!DOCTYPE html> <html> <head> <title>Javascript 设置数组的 length 属性为0，清空数组</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body> <div>设置数组 arr.length = 0 后，数组的长度为：</div> <div id="result"></div> <script> var arr = ['a','b','c','d','e','f']; arr.length = 0; console.log(arr); // 输出 [] document.getElementById("result").innerHTML = arr.length; </script> </body> </html>