查閱表單型態

document.form.elements[i].type 可查閱表單型態

程式碼如下：

        <form name = "F">
        	<input type="button" value="Button"><br>
        	<input type="checkbox" value="Checkbox"><br>
        	<input type="radio" value="Radio"><br>
        	<input type="text" value="Text"><br>
        </form>
		<script>
			var length = document.F.elements.length;
			for (var i = 0; i < length; i++){
				document.write("type of " + i + " is " + document.F.elements[i].type);
				document.write("<br>");
			}
		</script>        
    

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