Question

我正在尝试使用Javascript，尝试从数组参数中获取长度时得到了意外的空引用。为什么此代码不起作用？

这是错误消息：无法获取未定义或空引用的属性“ length”

        <!DOCTYPE html>
        <html>
        <head>
            <title></title>
        </head>
        <body>
            <h2>Phrase-o-matic</h2>
            <div id="example"></div>
        </body>
        <script>

            document.write(GetRandomWord(words1) + " " + GetRandomWord(words2) + " " + GetRandomWord(words3));

            var words1 = ["24/7", "multi-tier", "30 000 foot", "B-to-B", "win-win"];
            var words2 = ["empowered", "value-added", "oriented", "focused", "aligned"];
            var words3 = ["process", "solution", "tipping-point", "strategy", "vision"];

            function GetRandomWord(wordArray){
            var rand = Math.floor(Math.random()) * wordArray.length;
            var randomWord = wordArray[rand]; 

            return randomWord;
            }

        </script>
        </html>

Answer 1

正如其他人所述，必须在数组声明后移动document.write。

顺便说一句，您的随机生成代码也不起作用。改用它：

var rand = Math.floor(Math.random() * (wordArray.length - 1) + 1);

其中1是最小值，wordArray.length是最大值。

为什么我得到wordArray空引用异常

1 个答案: