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it unlocks many cool features!
- ```let name = 'zhangsan';
- name = 'lisi'; //let声明的变量可以重新被赋值
- const age= 21;//不可以被重新赋值
- let const 生命的变量都是block作用域
- { //block 作用域
- const num =1;
- {
- alert(num);
- }
- {
- let num2 = 2;
- }
- alert(num2);
- }
- 语法错误 未定义
- if(true){
- let num =1;
- }
- alert(num);//报错
- //let const var 多使用前两个
- ```
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