How to determine whether strings are equal in js

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Generally, "==" or "===" is used to judge the matching of two strings. The difference is:
1.== equality is the same, === identity is the same.
2.==, When the value types on both sides are different, type conversion must be performed first and then compared.
3.==, no type conversion is performed, and different types must not be equal.
①"=="match:

不同类型间比较，==之比较“转化成同一类型后的值”看“值”是否相等var str1="a";
var str2="b";
var str1="a";
if(str1 == str2)alert("相等");
else alert("不等");

②"==="match:

===如果类型不同，其结果就是不等var str2="1";
var str2="b";
var str1="a";
if(str1 === str2)alert("相等");
else alert("不等");

③mach object comparison:

var str1='1;2;3';
var str2='231';
function M(str1,str2){
function sort(s){return s.match(/\d/g).sort()+'' }
return sort(str1)==sort(str2)
}
alert( M(str1,str2)?'相等':'不等');

④equals method, such as:

if(pwd1.equals(pwd2)) {
...}

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