vue hello world项目
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var $ = require('../internals/export');
// `Math.signbit` method
// https://github.com/tc39/proposal-Math.signbit
$({ target: 'Math', stat: true, forced: true }, {
signbit: function signbit(x) {
return (x = +x) == x && x == 0 ? 1 / x == -Infinity : x < 0;
}
});