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    <title>DEV Community: tritanngo99</title>
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      <title>Error when calculating sum of 2 number in JS</title>
      <dc:creator>tritanngo99</dc:creator>
      <pubDate>Wed, 23 Jun 2021 08:41:00 +0000</pubDate>
      <link>https://dev.to/tritanngo99/error-when-calculating-sum-of-2-number-in-js-4lbk</link>
      <guid>https://dev.to/tritanngo99/error-when-calculating-sum-of-2-number-in-js-4lbk</guid>
      <description>&lt;p&gt;I try write JS to calcalculating sum of 2 number in JS, but I get error !&lt;br&gt;
This is mycode:&lt;br&gt;
&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight html"&gt;&lt;code&gt;&lt;span class="cp"&gt;&amp;lt;!DOCTYPE html&amp;gt;&lt;/span&gt;
&lt;span class="nt"&gt;&amp;lt;HTML&amp;gt;&lt;/span&gt;

    &lt;span class="nt"&gt;&amp;lt;HEAD&amp;gt;&lt;/span&gt;
    &lt;span class="nt"&gt;&amp;lt;TITLE&amp;gt;&lt;/span&gt;Thay đổi giá trị của thuộc tính&lt;span class="nt"&gt;&amp;lt;/TITLE&amp;gt;&lt;/span&gt;
    &lt;span class="nt"&gt;&amp;lt;META&lt;/span&gt; &lt;span class="na"&gt;http-equiv=&lt;/span&gt;&lt;span class="s"&gt;"Content-Type"&lt;/span&gt; &lt;span class="na"&gt;content=&lt;/span&gt;&lt;span class="s"&gt;"text/html; charset=utf-8"&lt;/span&gt;&lt;span class="nt"&gt;&amp;gt;&lt;/span&gt;
    &lt;span class="nt"&gt;&amp;lt;/HEAD&amp;gt;&lt;/span&gt;

    &lt;span class="nt"&gt;&amp;lt;BODY&amp;gt;&lt;/span&gt;
    &lt;span class="nt"&gt;&amp;lt;h2&amp;gt;&lt;/span&gt;Hãy nhập hai số và click vào nút Tính tổng&lt;span class="nt"&gt;&amp;lt;/h2&amp;gt;&lt;/span&gt;
    &lt;span class="nt"&gt;&amp;lt;INPUT&lt;/span&gt; &lt;span class="na"&gt;type=&lt;/span&gt;&lt;span class="s"&gt;"text"&lt;/span&gt; &lt;span class="na"&gt;name=&lt;/span&gt;&lt;span class="s"&gt;"SoHang1"&lt;/span&gt; &lt;span class="nt"&gt;&amp;gt;&lt;/span&gt; +
    &lt;span class="nt"&gt;&amp;lt;INPUT&lt;/span&gt; &lt;span class="na"&gt;type=&lt;/span&gt;&lt;span class="s"&gt;"text"&lt;/span&gt; &lt;span class="na"&gt;name=&lt;/span&gt;&lt;span class="s"&gt;"SoHang2"&lt;/span&gt;&lt;span class="nt"&gt;&amp;gt;&lt;/span&gt; =
    &lt;span class="nt"&gt;&amp;lt;INPUT&lt;/span&gt; &lt;span class="na"&gt;type=&lt;/span&gt;&lt;span class="s"&gt;"text"&lt;/span&gt; &lt;span class="na"&gt;name=&lt;/span&gt;&lt;span class="s"&gt;"KetQua"&lt;/span&gt;&lt;span class="nt"&gt;&amp;gt;&lt;/span&gt;
    &lt;span class="nt"&gt;&amp;lt;INPUT&lt;/span&gt; &lt;span class="na"&gt;type=&lt;/span&gt;&lt;span class="s"&gt;"button"&lt;/span&gt; &lt;span class="na"&gt;value=&lt;/span&gt;&lt;span class="s"&gt;"Sum"&lt;/span&gt;
    &lt;span class="na"&gt;onClick=&lt;/span&gt;&lt;span class="s"&gt;"KetQua.value = parseFloat(SoHang1.value) + parseFloat(SoHang2.value)"&lt;/span&gt;&lt;span class="nt"&gt;&amp;gt;&lt;/span&gt;
    &lt;span class="nt"&gt;&amp;lt;/BODY&amp;gt;&lt;/span&gt;

    &lt;span class="nt"&gt;&amp;lt;/HTML&amp;gt;&lt;/span&gt;
&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;



&lt;p&gt;So, I hope everyone can help me fix this error ! Thanks !&lt;/p&gt;

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