cannot read property 'toFixed' of undefined

"Cannot read property 'toFixed' of undefined"这个错误通常表示在代码中尝试对一个未定义的变量应用toFixed方法。这个错误通常发生在你尝试对一个不是Number类型的变量使用toFixed方法时。确保在使用toFixed方法之前，你的变量是一个有效的数字类型。如果你对一个未定义的变量使用了toFixed方法，你可以先检查该变量是否已经被正确地初始化或赋值。另外，也可以使用typeof操作符来检查变量的数据类型，确保它是一个数字类型。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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