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<!doctype html>
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读书笔记
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<h1>个人管理规划</h1>
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<p><img src="media/15189261881148/%E4%B8%AA%E4%BA%BA%E7%AE%A1%E7%90%86.png" alt="个人管理"/></p>
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<div class="more-left left">
<span class="date">2018/2/18</span>
<span>posted in </span>
<span class="posted-in"><a href='%E4%B8%AA%E4%BA%BA%E7%AE%A1%E7%90%86.html'>个人管理</a></span>
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<h1>函数扩展</h1>
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<h3 id="toc_0">参数默认值</h3>
<p>ES6 的写法还有两个好处：首先，阅读代码的人，可以立刻意识到哪些参数是可以省略的，不用查看函数体或文档；其次，有利于将来的代码优化，即使未来的版本在对外接口中，彻底拿掉这个参数，也不会导致以前的代码无法运行。</p>
<p>（1）函数体内的this对象，就是定义时所在的对象，而不是使用时所在的对象。</p>
<p>（2）不可以当作构造函数，也就是说，不可以使用new命令，否则会抛出一个错误。</p>
<p>（3）不可以使用arguments对象，该对象在函数体内不存在。如果要用，可以用 rest 参数代替。</p>
<p>（4）不可以使用yield命令，因此箭头函数不能用作 Generator 函数。</p>
<p>上面四点中，第一点尤其值得注意。this对象的指向是可变的，但是在箭头函数中，它是固定的。</p>
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<div class="more-left left">
<span class="date">2018/1/28</span>
<span>posted in </span>
<span class="posted-in"><a href='ECMA6.html'>ECMA6</a></span>
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<h1>ES6 spread操作符、rest操作符、Destructuring解构赋值</h1>
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<h4 id="toc_0">rest 参数(函数里使用)</h4>
<p>ES6 引入 rest 参数（形式为...变量名），用于获取函数的多余参数，这样就不需要使用arguments对象了。rest 参数搭配的变量是一个数组，该变量将多余的参数放入数组中。</p>
<p>函数里用 参数用…reset 是把参数数字转成数组</p>
<pre><code>function add(...values) {
let sum = 0;
for (var val of values) {
sum += val;
}
return sum;
}
add(2, 5, 3) // 10
// arguments变量的写法
function sortNumbers() {
return Array.prototype.slice.call(arguments).sort();
}
// rest参数的写法
const sortNumbers = (...numbers) => numbers.sort();
</code></pre>
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<span class="date">2018/1/28</span>
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