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js implements an approach that does not repeat imports

  • 2021-01-19 22:02:01
  • OfStack

This article shows an example of how js implements non-repeat imports. To share with you for your reference, as follows: 


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title> No title page </title>
  <mce:script src="jquery-1.4.4.js" mce_src="jquery-1.4.4.js" type="text/javascript"></mce:script>
  <mce:script type="text/javascript"><!--
    function importOnce(scriptPath) {
      var scripts = document.getElementsByTagName("script");
      for (var index = 0; index < scripts.length; index++) {
        if (scripts[index].src.lastIndexOf(scriptPath) != -1) {
          return;
        }
      }
      var scriptTag = document.createElement("script");
      scriptTag.type = "text/javascript";
      scriptTag.src = scriptPath;
      var headTag = document.getElementsByTagName("head")[0];
      headTag.appendChild(scriptTag);
    }
    importOnce("jquery-1.4.4.js");
    importOnce("jquery-1.4.4.js");
    importOnce("jquery-1.4.3.js");
    importOnce("jquery-1.4.3.js");
// --></mce:script>
</head>
<body>
</body>
</html>

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I hope this article is helpful to JavaScript program design.

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