<script>
function a()
{
.....
}
</script>
<body>
<input type="text" onkeydown="if(event.keyCode==13) a();" >
</body>
<script>
function a()
{
.....
return false;
}
</script>
<body>
<input type="text" onkeydown="if(event.keyCode==13) return a();" >
</body>
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