Detailed explanation of JavaScript string judgment method

The main judgment symbols in

Javascript are: ==,! =、===、! ==

==、! =These two symbols will first convert the variabletype before judging. If the types are the same, the values ​​will be compared;

===,! == This is to directly judge the types of two variables. If the types are inconsistent, the judgment will be made directly without comparing the values.

demo:

function bijiao(){

var str="123";

var num=123;

var char='123';

alert(srt==num);//true

alert(str==char);//true

alert(str= ==num);//false

　alert(str!==num);//true

}

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