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NaN undefined 0 null "" 会转换成false
其余都是true
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基本数据(简单数据类型 值类型)类型存放在栈中,引用数据类型(复杂数据类型 对象类型)的数据存放在堆中,但是引用数据类型的地址存放在栈中
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typeof检测引用类型function的时候 会返回function 而不是object,这是在设计js的时候检测引用类型,会检查是否包含[ [call] ]方法,包含的会返回function 不包含的返回object
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typeof检查null的时候 返回的数据类型是根据机器码的后三位而决定的 当检测到null的时候返回000 =>object
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function instanceof(A,B){ let p=A while(p){ if(p===B.prototype){ return true } p=p._proto_ } return false }typeof 返回的是数据的类型，instanceof返回的是布尔值
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遍历赋值 -> 简单循环赋值是浅拷贝，递归循环判断类型赋值：是深拷贝
Object.create() -> 简单循环赋值是浅拷贝，递归循环判断类型赋值：是深拷贝
JSON.parse()和JSON.stringify() ->深拷贝
深浅拷贝：假设B复制了A,当修改A时，看B是否发生变化，B变了，说明时浅拷贝；B没变，就是深拷贝
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老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好
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老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好
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老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好
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老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好老师讲得好
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老师讲得好老师讲得好老师讲得好
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