a.toString()
时间: 2024-04-24 08:23:57 浏览: 10
a.toString()是将变量a转换为字符串类型的方法。根据引用\[1\]中的说明,toString()方法适用于String、Number和Boolean类型的数据,但对于null和undefined类型的数据,直接转换成字符串"null"和"undefined"。所以,如果a是null或undefined类型的变量,调用a.toString()会报错。
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