6 values in JS are 'false'

1.false（ Boolean type ）;

2.null（ Used to define empty or nonexistent references ）;

3.undefined（ Undefined value ）;

4.0（ Numerical type ）;

5. An empty string ‘’（ String type ）;

6.NaN

In addition to this 6 Outside , Others are “ really ” , Including objects 、 Array 、 Regular 、 Functions, etc . Be careful '0'、'null'、'false'、{}、[] It's all true .

this 6 Values are false , They are not equal

about ‘==’, Come to the conclusion ：

false In addition to being compared with oneself true outside , and 0,‘’ The comparison is also true;

null And the only undefined The comparison is true, In turn, undefined Only with null Compared with ture, There is no second ;

0 Except for and false Compared with true, There are also empty strings and empty arrays []

Empty string except and false Compared with true outside , And also 0 Compared with true