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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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