Peer: background von div per Javascript ändern

Beitrag lesen

Hello World,

ich poste mal meine komplette test-Datei
Irgendwie scheine ich da was zu übersehen...
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<script type="text/javascript">
function test()
         {
         document.getElementByID('box_1').style.background="green";
         }
</script>
</head>
<body style="background:grey;">
<div id="box_1" style="height:50px;width:200px;background:yellow;text-align:center;">Mein Text</div>
<a href="javascript:void()" onclick="test">Farbe wechsel Dich</a>
</body>
</head>
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thx