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Update 0242.有效的字母异位词.md

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`@@ -181,6 +181,31 @@ func isAnagram(s string, t string) bool {`
`181`	`181`	`}`
`182`	`182`	```
`183`	`183`
	`184`	`+Go 写法二(只对字符串遍历一次)`
	`185`	+```go
	`186`	`+func isAnagram(s string, t string) bool {`
	`187`	`+ if len(s) != len(t) {`
	`188`	`+ return false`
	`189`	`+ }`
	`190`	`+ records := [26]int{}`
	`191`	`+ for index := 0; index < len(s); index++ {`
	`192`	`+ if s[index] == t[index] {`
	`193`	`+ continue`
	`194`	`+ }`
	`195`	`+ sCharIndex := s[index] - 'a'`
	`196`	`+ records[sCharIndex]++`
	`197`	`+ tCharIndex := t[index] - 'a'`
	`198`	`+ records[tCharIndex]--`
	`199`	`+ }`
	`200`	`+ for _, record := range records {`
	`201`	`+ if record != 0 {`
	`202`	`+ return false`
	`203`	`+ }`
	`204`	`+ }`
	`205`	`+ return true`
	`206`	`+}`
	`207`	+```
	`208`	`+`
`184`	`209`	`### JavaScript:`
`185`	`210`
`186`	`211`	```js

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