var even = function(x) { // 判断a是否为偶数的函数 return x % 2 === 0; };
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var even = function(x) { // 判断x是否为偶数的函数 return x % 2 === 0; };
P203
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var r = range(1, 3); console.log(r.includes(2)); r.foreach(console.log); console.log(r); // 输出(1...3)
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var r = range(1, 3); console.log(r.includes(2)); r.foreach(console.log); // node下正确 chrome/firefox的 Console 下输出如下错误: // TypeError: 'log' called on an object that does not implement interface Console // 参考: https://bugzilla.mozilla.org/show_bug.cgi?id=989619 console.log(r); // node下: { from: 1, to: 3 } chrome下: Object {from: 1, to: 3, includes: function, foreach: function, toString: function}