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Defer javascript - Google way

<!-- Put this before </body> tag -->

<script type="text/javascript">
    function downloadJSAtOnload() {
    var element = document.createElement("script");
    element.src = "defer.js";
    document.body.appendChild(element);
    }
    if (window.addEventListener)
    window.addEventListener("load", downloadJSAtOnload, false);
    else if (window.attachEvent)
    window.attachEvent("onload", downloadJSAtOnload);
    else window.onload = downloadJSAtOnload;
</script>
https://snipt.net/embed/20bc31b33e50f4acd1207c67b5d69287/
/raw/20bc31b33e50f4acd1207c67b5d69287/
20bc31b33e50f4acd1207c67b5d69287
html
HTML
14
2019-06-16T00:29:34
True
False
False
/api/public/snipt/116082/
defery-javascript-google-way
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1"> 1</a> <a href="#L-2"> 2</a> <a href="#L-3"> 3</a> <a href="#L-4"> 4</a> <a href="#L-5"> 5</a> <a href="#L-6"> 6</a> <a href="#L-7"> 7</a> <a href="#L-8"> 8</a> <a href="#L-9"> 9</a> <a href="#L-10">10</a> <a href="#L-11">11</a> <a href="#L-12">12</a> <a href="#L-13">13</a> <a href="#L-14">14</a></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a><span class="c">&lt;!-- Put this before &lt;/body&gt; tag --&gt;</span> </span><span id="L-2"><a name="L-2"></a> </span><span id="L-3"><a name="L-3"></a><span class="p">&lt;</span><span class="nt">script</span> <span class="na">type</span><span class="o">=</span><span class="s">&quot;text/javascript&quot;</span><span class="p">&gt;</span> </span><span id="L-4"><a name="L-4"></a> <span class="kd">function</span> <span class="nx">downloadJSAtOnload</span><span class="p">()</span> <span class="p">{</span> </span><span id="L-5"><a name="L-5"></a> <span class="kd">var</span> <span class="nx">element</span> <span class="o">=</span> <span class="nb">document</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span><span class="s2">&quot;script&quot;</span><span class="p">);</span> </span><span id="L-6"><a name="L-6"></a> <span class="nx">element</span><span class="p">.</span><span class="nx">src</span> <span class="o">=</span> <span class="s2">&quot;defer.js&quot;</span><span class="p">;</span> </span><span id="L-7"><a name="L-7"></a> <span class="nb">document</span><span class="p">.</span><span class="nx">body</span><span class="p">.</span><span class="nx">appendChild</span><span class="p">(</span><span class="nx">element</span><span class="p">);</span> </span><span id="L-8"><a name="L-8"></a> <span class="p">}</span> </span><span id="L-9"><a name="L-9"></a> <span class="k">if</span> <span class="p">(</span><span class="nb">window</span><span class="p">.</span><span class="nx">addEventListener</span><span class="p">)</span> </span><span id="L-10"><a name="L-10"></a> <span class="nb">window</span><span class="p">.</span><span class="nx">addEventListener</span><span class="p">(</span><span class="s2">&quot;load&quot;</span><span class="p">,</span> <span class="nx">downloadJSAtOnload</span><span class="p">,</span> <span class="kc">false</span><span class="p">);</span> </span><span id="L-11"><a name="L-11"></a> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="nb">window</span><span class="p">.</span><span class="nx">attachEvent</span><span class="p">)</span> </span><span id="L-12"><a name="L-12"></a> <span class="nb">window</span><span class="p">.</span><span class="nx">attachEvent</span><span class="p">(</span><span class="s2">&quot;onload&quot;</span><span class="p">,</span> <span class="nx">downloadJSAtOnload</span><span class="p">);</span> </span><span id="L-13"><a name="L-13"></a> <span class="k">else</span> <span class="nb">window</span><span class="p">.</span><span class="nx">onload</span> <span class="o">=</span> <span class="nx">downloadJSAtOnload</span><span class="p">;</span> </span><span id="L-14"><a name="L-14"></a><span class="p">&lt;/</span><span class="nt">script</span><span class="p">&gt;</span> </span></pre></div> </td></tr></table>
defer, javascript, loading