It is a cliche that 0 in js is true or false

Think of a fun one and run the following javascript:

if ('0') alert("'0' is true");
if ('0' == false) alert("'0' is false");

As a result, both alert! So is' 0 'true or false?

The answer is: When comparing js, there are three rules:

If there is bool in the comparison, bool will be converted into the corresponding number, that is, 0 and 1

If number1 and string are compared, string will be converted into a number

When converting string directly to bool, the empty string ''is converted to false, and the other 1-cut string is converted to true