can't access lexical declaration `a' before initialization

其他 2019-04-17 16:38:03 阅读次数: 0

 
  <script type="text/javascript"> 
 
   alert(a); 
 
   let a=2; 
 
  </script> 
 
以上代码报错：
      
ReferenceError: can't access lexical declaration `a' before initialization（在初始化之前，不能使用变量a）

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转载自www.cnblogs.com/jianxingjianyuan/p/10724297.html

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