EduCoder_web training assignment-JavaScript learning manual 13: HTML DOM-operation of document elements (1)

first round

<!-- 请在此处编写代码 -->
        <!---------Begin--------->
          var myElement =document.getElementById("a1");

        <!---------End--------->

Second level

<!-- 请在此处编写代码 -->
        <!---------Begin--------->
      var myElement=document.getElementsByTagName('p')[0]

        <!---------End--------->

Third pass

<!-- 请在此处编写代码 -->
    <!---------Begin--------->
     var myElement=document.getElementsByTagName('div')[1].getElementsByTagName('a')[1]

    <!---------End--------->

Fourth level

<!-- 请在此处编写代码 -->
        <!---------Begin--------->
        var pElement =document.querySelector("body p");

        <!---------End--------->

Fifth level

<!-- 请在此处编写代码 -->
        <!---------Begin--------->
         var pElement =document.querySelectorAll("body");

        <!---------End--------->

Sixth pass

 <!-- 请在此处编写代码 -->
      <!---------Begin--------->
      myElement = cl2.firstElementChild.children[1]

      <!---------End--------->

Seventh pass

<!-- 请在此处编写代码 -->
        <!---------Begin--------->
              var srcValue =document.getElementsByTagName('img')[0].getAttribute("class")

        <!---------End--------->

Eighth level

	<!-- 请在此处编写代码 -->
        <!---------Begin--------->
           var myElement =document.getElementById('form1').setAttribute('method','post')     

        <!---------End--------->

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