1
1. bool in number --true=1,flase = 0;
22.bool used in string ,true = "true",false = "false";
33.number used as boolean---!0&&!NaN = true
43.string not empty,not null and undefine = true
1. bool in number --true=1,flase = 0;2
2.bool used in string ,true = "true",false = "false";3
3.number used as boolean---!0&&!NaN = true4
3.string not empty,not null and undefine = true