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Merge branch 'gh-pages' of github.com:ruanyf/es6tutorial into gh-pages

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@ -353,7 +353,7 @@ Math.trunc = Math.trunc || function(x) {
### Math.sign() ### Math.sign()
`Math.sign`方法用来判断一个数到底是正数、负数、还是零。 `Math.sign`方法用来判断一个数到底是正数、负数、还是零。对于非数值，会先将其转换为数值。
它会返回五种值。 它会返回五种值。
@ -369,6 +369,7 @@ Math.sign(5) // +1
Math.sign(0) // +0 Math.sign(0) // +0
Math.sign(-0) // -0 Math.sign(-0) // -0
Math.sign(NaN) // NaN Math.sign(NaN) // NaN
Math.sign('9'); // +1
Math.sign('foo'); // NaN Math.sign('foo'); // NaN
Math.sign(); // NaN Math.sign(); // NaN
``` ```