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upd: 回文数

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README.md
src
- palindromeNumber.js

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`‎README.md`

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Original file line number	Diff line number	Diff line change
`@@ -15,3 +15,4 @@ LeetCode JavaScript Solution`
`15`	`15`	`\| Longest Palindromic Substring \| Medium \| 2018年01月19日 \|`
`16`	`16`	`\| Reverse Integer \| Easy \| 2018年01月19日 \|`
`17`	`17`	`\| Regular Expression Matching \| Hard \| 2018年03月09日 \|`
	`18`	`+\| Palindrome Number \| Easy \| 2018年03月16日 \|`

`‎src/palindromeNumber.js`

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`@@ -0,0 +1,22 @@`
	`1`	`+/**`
	`2`	`+ * @param {number} x`
	`3`	`+ * @return {boolean}`
	`4`	`+ */`
	`5`	`+var isPalindrome = function(x) {`
	`6`	`+ if (x < 0) return false;`
	`7`	`+ let temp = Math.abs(x).toString();`
	`8`	`+ let i = 0, j = temp.length - 1;`
	`9`	`+ let ret = true;`
	`10`	`+ while (i < j) {`
	`11`	`+ if (temp[i] === temp[j]) {`
	`12`	`+ ++i;`
	`13`	`+ --j;`
	`14`	`+ } else {`
	`15`	`+ ret = false;`
	`16`	`+ break;`
	`17`	`+ }`
	`18`	`+ }`
	`19`	`+ return ret;`
	`20`	`+};`
	`21`	`+`
	`22`	`+isPalindrome(-2147447412);`

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