现象：el-input或者input标签中，输入空格无效，并不能加入到字符串中。
原因：众多原因之一：
1. 首先，这是在vue项目中，那么检查el-input或者input外层包的dom元素。
检查是否有el-menu这个元素包在了el-input外层或者input外层，如果有，那么el-menu会导致其中的el-input或input输入框的空格无效。
2.待定。。。
解决方法：
1.原因1的解决方法，不使用el-menu包含el-input或input
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