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<p><strong>常见的误区是</strong>：“== 检查值是否相等，=== 检查值和类型是否相等”</p>
<p><strong>正确的解释是</strong>：“== 允许在相等比较中进行强制类型转换，而=== 不允许。”<br>
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CommonJS与ES6模块规范
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<p>在ES6之前，模块规范最主要的有CommonJS和AMD两种。前者用于服务器，后者用于浏览器。ES6在语言规格的层面上，实现了模块功能，而且实现得相当简单，完全可以取代现有的CommonJS和AMD规范，成为浏览器和服务器通用的模块解决方案。ES6模块的设计思想，是尽量的静态化，使得编译时就能确定模块的依赖关系，以及输入和输出的变量。 –《ES6标准入门》</p>
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<p>以上大体说明了ES6的模块规范和其他主流的规范剑的区别，接下来结合这几天的学习，总结下CommonJS和ES6这两种规范，以及它们的差异和优缺点，纯属个人学习总结，不喜勿喷哦！</p>
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<p>导语：</p>
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<p>本文主要归纳总结自《你不知道的JavaScript上卷》中的关于this的解析。</p>
</blockquote>
<ul>
<li>this既不指向函数自身也不止像函数的词法作用域；</li>
<li>this是在函数被调用时发生的绑定，它指向什么完全取决于函数在哪里被调用。</li>
<li>this的绑定和函数声明的位置没有任何关系，只取决于函数的调用。</li>
</ul>
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<p>Javascript数组Array的forEach扩展方法 forEach是最常用到的数组扩展方法之一，相当于参数化循环数组，它简单的在数组的每一个元素上应用传入的函数，这也意味着只有存在的元素会被访问和处理。</p>
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