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<!DOCTYPE html>
<html>
<head> <meta charset="utf-8">
<meta name="viewport" content="width=device-width,height=device-height,initial-scale=1,user-scalable=0">
<meta name="author" content="微信公众号：颜家大少">
<meta name="email" content="[email protected]">
<meta name="description" content="一个Markdown在线转换工具，让Markdown内容，不需作任何调整就能同时在微信公众号、博客园、掘金、csdn等平台正确显示当前预览的效果">
<title>Md2All export document</title>
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</head><body><div id="export_content"><div class="output_wrapper" id="output_wrapper_id"><h1 id="hday30"><span>day30</span></h1>
<h3 id="hjs"><span>js的数据类型</span></h3>
<p>变量是没有类型的，数据是有类型的，6 种数据类型 </p>
<p>数值（number）：整数和小数（比如 1 和 3.14） </p>
<p>字符串（String）：字符组成的文本（比如"Hello World"） </p>
<p>布尔值（boolean）：true（真）和 false（假）两个特定值 </p>
<p>undefifined：表示“未定义”或不存在，即此处目前没有任何值 </p>
<p>null：表示空缺，即此处应该有一个值，但目前为空 </p>
<p>对象（object）：各种值组成的集合 <strong>对象 数组 函数</strong></p>
<blockquote>
<p>通常将数值、字符串、布尔值称为原始类型</p>
<p> 将对象称为合成类型</p>
</blockquote>
<p>js是解释型，弱类型语言，还有一种是动态语言 eval函数</p>
<table>
<thead>
<tr>
<th>类型</th>
<th>返回类型</th>
</tr>
</thead>
<tbody>
<tr>
<td>原始类型 ：数值、字符串、布尔值</td>
<td>分别返回 number、 string、 boolean</td>
</tr>
<tr>
<td>函数</td>
<td>返回 function</td>
</tr>
<tr>
<td>undefifined</td>
<td>返回 undefifined</td>
</tr>
<tr>
<td>其他</td>
<td>除此以外，都返回 object</td>
</tr>
</tbody>
</table>
<h3 id="hnullundefifined"><span>null 与 undefifined的区别</span></h3>
<blockquote>
<p>null 表示空值，即该处的值现在为空；</p>
<p>undefifined 表示不存在值，就是此处目前不存在任何值，</p>
</blockquote>
<h3 id="h"><span>数据类型转换</span></h3>
<blockquote>
<p>转换函数、强制类型转换、利用 js 变量弱类型转换</p>
</blockquote>
<table>
<thead>
<tr>
<th>方法</th>
<th>解释</th>
</tr>
</thead>
<tbody>
<tr>
<td>有parseInt()和 parseFloat()两个转换函数。前者把值转换成整数，后者把值转换成浮点数。</td>
<td>只有对 String类型调用这些方法，这两个函数才能正确运行；对其他类型返回的都是 NaN(Not a Number)</td>
</tr>
<tr>
<td>Boolean(value）把给定的值转换成 Boolean 型；Number(value)把给定的值转换成数字，String(value)把给定的值转换成字符串</td>
<td>用这三个函数之一转换值，将创建一个新值，存放由原始值直接转换成的值。</td>
</tr>
<tr>
<td>var str= '012.345 '; var x = str-0;</td>
<td></td>
</tr>
</tbody>
</table>
<blockquote>
<p>Boolean():放入除了{空字符串、数字 0、undefifined 或 null，返回false }其他返回true</p>
</blockquote>
<h3 id="h-1"><span>三个弹出框</span></h3>
<table>
<thead>
<tr>
<th>种类</th>
<th>代码</th>
</tr>
</thead>
<tbody>
<tr>
<td>警告框</td>
<td>window.alert(" ");</td>
</tr>
<tr>
<td>确认框</td>
<td>window.confirm(" ")</td>
</tr>
<tr>
<td>输入框</td>
<td>window.prompt(“ ”);</td>
</tr>
</tbody>
</table>
<h3 id="h-2"><span>获取元素的方法</span></h3>
<blockquote>
<p> 1：id id属性值 返回值：ele<br> 2：name name名称 返回值：collection<br> 3：className类名称 返回值：collection<br> 4.tagName:标签名称 返回值：collection</p>
</blockquote>
<pre><code class="js language-js hljs javascript"> <span class="hljs-keyword">var</span> divId = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">"dv"</span>);<br><br> <span class="hljs-keyword">var</span> divName = <span class="hljs-built_in">document</span>.getElementsByName(<span class="hljs-string">"dv"</span>)[<span class="hljs-number">0</span>];<br><br> <span class="hljs-keyword">var</span> divClassName = <span class="hljs-built_in">document</span>.getElementsByClassName(<span class="hljs-string">"dv"</span>)[<span class="hljs-number">0</span>];<br><br> <span class="hljs-keyword">var</span> divTagName = <span class="hljs-built_in">document</span>.getElementsByTagName(<span class="hljs-string">"div"</span>)[<span class="hljs-number">0</span>];<br></code></pre>
<h3 id="h-3"><span>三个值的属性</span></h3>
<pre><code class="js language-js hljs javascript"><span class="hljs-keyword">var</span> test = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">"test"</span>);<br> test.value=<span class="hljs-string">"测试"</span>;<br><br> <span class="hljs-keyword">var</span> dv = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">"dv"</span>);<br> dv.innerHTML=<span class="hljs-string">"<span style='color:red'>信息</span>"</span>;<br> dv.innerText=<span class="hljs-string">'<span style="color:red">message</span>'</span>;<br></code></pre>
<h3 id="h-4"><span>几个事件</span></h3>
<blockquote>
<p>onload事件，body有onload事件</p>
<p>onclick事件：点击触发</p>
<p>onchange事件：改变</p>
</blockquote>
<pre><code class="js language-js hljs javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getVal</span>(<span class="hljs-params">t</span>)</span>{<br> <span class="hljs-built_in">console</span>.log(t.value);<br> }<br></code></pre></div></div></body>
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