打扰一下，有一个问题想咨询你一下 about underscore-analysis HOT 9 CLOSED

  function isFunction(value) {
    return typeof value == 'function';
  }

  var fnc = function() {};
  var obj = { 'a': 'b' };
  var num = 1;
  var xml = window.ActiveXObject ? new ActiveXObject('Msxml2.DOMDocument.3.0') : {};

  console.log('before JIT isFunction(fnc). Expected: true;  Got:', isFunction(fnc));
  console.log('before JIT isFunction(obj). Expected: false; Got:', isFunction(obj));
  console.log('before JIT isFunction(num). Expected: false; Got:', isFunction(num));
  console.log('before JIT isFunction(xml). Expected: false; Got:', isFunction(xml));

  var count = 200;
  while (count--) {
    isFunction(fnc);
  }
  console.log('typeof xml', typeof xml);

  console.log('after JIT isFunction(fnc). Expected: true;  Got:', isFunction(fnc));
  console.log('after JIT isFunction(obj). Expected: false; Got:', isFunction(obj));
  console.log('after JIT isFunction(num). Expected: false; Got:', isFunction(num));
  console.log('after JIT isFunction(xml). Expected: false; Got:', isFunction(xml));

after JIT isFunction(xml).   Expected: false; Got: true

var div = document.createElement('div');

// JIT the function
var count = 200;
while (count--) {
    _.isFunction(fn);
}

equal(_.isFunction(div), false);

                var obj = {}

		var type = typeof obj

		console.log(type === 'function');
		console.log(type === 'object');

		console.log('----------');

		console.log((typeof obj) === 'function')
		console.log((typeof obj) === 'object')