A brief analysis of implicit type conversion steps in JavaScript

The implicit type conversion mentioned here is a conversion caused by ==.

1. If NaN exists, false will be returned
2. See if there is a boolean. If there is a boolean, convert the boolean into a number
3. Next, see if there are strings. There are three situations: the other party is an object, and the object is converted using toString; the other party is a number, and the string is converted to a number; the other party is a string, and the comparison is direct; the other party returns false
4. If it is a number, the other party is an object, the object takes valueOf for comparison, and all others will return false
5. null, undefined will not perform type conversion, but they are equal

This order must be memorized, which is often asked during interviews.

Below are some miscellaneous questions, do it yourself

0 == undefined
1 == true
2 == {valueOf: function(){return 2}}
NaN == NaN
 8 == undefined
1 == undefined
 null == {toString: function(){return 2}}
 0 == null
 null == 1
 { toString:function(){ return 1 } , valueOf:function(){ return [] }} == 1

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