TypeError: elem.nodeName is undefined
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执行程序时打开ff浏览器的调试模式，出现上面的错误TypeError: elem.nodeName is undefined，从网上看都是说的是jQuery里面报的错，通过依次打开开发者工具-调试器可以从里面打断点，查看原因
从里面可以看到变量的值为undefined,原来是左边的赋值有问题，原因是val写错了，后面还需要加括弧val();加上之后在执行确定，数值就能正常赋值了；
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