<script>
x_id="a1"
x_type="text"
x_value="123"
x_name="a1"
x_onclick="alert()"
document.write("<INPUT id="+x_id+" type="+x_type+" value="+x_value+" name="+x_name+" onclick="+x_onclick+">");
</script>
x_id="a1"
x_type="text"
x_value="123"
x_name="a1"
x_onclick="alert()"
document.write("<INPUT id="+x_id+" type="+x_type+" value="+x_value+" name="+x_name+" onclick="+x_onclick+">");
</script>
test
</body>
<script>
var obj=document.createElement("INPUT");
document.body.insertAdjacentElement("beforeEnd",obj);
obj.id="a1"
obj.type="text"
obj.value="123"
obj.name="a1"
obj.onclick=function(){alert(this.value)};
</script>