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node_modules/is-number/index.js 420 Bytes
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aaac7fed   liuqimichale   add 
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  /*!
   * is-number <https://github.com/jonschlinkert/is-number>
   *
   * Copyright (c) 2014-2015, Jon Schlinkert.
   * Licensed under the MIT License.
   */
  
  'use strict';
  
  var typeOf = require('kind-of');
  
  module.exports = function isNumber(num) {
    var type = typeOf(num);
  
    if (type === 'string') {
      if (!num.trim()) return false;
    } else if (type !== 'number') {
      return false;
    }
  
    return (num - num + 1) >= 0;
  };