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Update 7-reverseInteger.js

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Original file line number	Diff line number	Diff line change
`@@ -10,7 +10,10 @@ var reverse = function(x) {`
`10`	`10`	`revX=revX*10+last;`
`11`	`11`	`absX=(absX-last)/10;`
`12`	`12`	`}`
`13`		`-`
	`13`	`+`
	`14`	`+/**`
	`15`	`+ * let revX = parseFloat(x.toString().split('').reverse().join(''));`
	`16`	`+ */`
`14`	`17`	`// in case overflow, in JavaScript maximum number is 2^31 - 1`
`15`	`18`	`if(revX>Math.pow(2,31)-1)return0;`
`16`	`19`

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