JS current attribute query implementation code_javascript skills

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<meta charset="utf-8"> <title>Website title</title> <style type="text/css"> #div1 .bObject { cursor:pointer; color:Blue; } #div1 .bError { color:Red; } #div1 div { margin-left:20px; border:solid 1px gray; padding:5px; } #div1 th { text-align:left; background-color:#fef; } #div1 td { vertical-align:top; } </style> <div> <input id="txt" type="text" value="window" style="width:300px;"> <div style="margin:10px 0px;"> <input onclick="getObject();" type="button" value="检 测"> <input onclick="goUp();" type="button" value="向 上"> <input id="chkNull" type="checkbox" checked> <label for="chkNull"></label>Mask null values</div> </div> <div id="div1" style="line-height:1.5; font-family:Consolas; font-size:14px;"> </div>
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