In JavaScript, == === with other relational operators and values are the same boolean value is true, but the two conditions are not the same, as long as both sides == content, even if the data type is not the same, the return value is true; but both ends === must be strictly congruent, that is, content and data type to be the same, only the value of the expression is true, the following is an example:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
function test(){
console.log(5==5);
console.log(5=='5');
console.log(5==='5');
}
</script>
<b οnclick="test()">按钮</b>
</body>
</html>
