JavaScript number vs. string comparison size

In summary JS often encounter pure numbers and a variety of strings to compare:

• A comparison between pure numbers

alert (1<3);//true

• Numeric string comparisons that convert its first to numbers

Alert ("1" < "3");//true

Alert ("123" < "123");//false

• Pure string comparison, first turn into ASCII code

Alert ("A" < "B");//true

　　　Alert ("ABC" < "AAD"),//false, multi-letter comparison, will compare ASCII code in turn

• Comparison of Chinese characters

　　　Alert ("Me". charCodeAt ());//25105

Alert ("of". charCodeAt ());//30340

　　　Alert ("I" < ");//true, kanji comparison, turn ASCII code

• When a number is compared with a string, and the string is a number. Convert a numeric string to a number

Alert (123< "124"),//true, the following code shows that ASCII code 124 is 49, so it is not converted to ASCII comparison

Alert ("124". charCodeAt ());//49

• When a number is compared to a string and the string is a non-pure number, converting a non-numeric string to a number is converted to Nan, and false is returned regardless of the size of Nan and the number comparison.
  

Alert (13> "ABC");//false

JavaScript number vs. string comparison size