（九）javaScript的基本使用

<script type="text/javascript">

				var userName;

				var userAge;

				function interInfo(){

					userName=prompt("请输入您的姓名");

					userAge=prompt("请输入您的年龄");

				}

				function showInfo(){

					document.write("您的名字是"+userName+"您的年龄是"+userAge);

				}

		</script>

	</head>

	<body>

		<p>信息登记系统</p>

		<button onclick="interInfo();">填写个人信息</button>

		<button onclick="showInfo();">显示信息</button>

	</body>

结果：

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" alt="" 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" 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" alt="" />

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alt="" 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alt="" />

解析： prompt(msg,defaultText)参数

	描述
msg	可选。要在对话框中显示的纯文本（而不是 HTML 格式的文本）。
defaultText	可选。默认的输入文本。

<script type="text/javascript">

				function jisuan(){

					var price=document.jisuanqi.price.value;

					var mount=document.jisuanqi.mount.value;

					var total=parseFloat(price)*parseFloat(mount);

					document.jisuanqi.total.value=total;

				}

		</script>

	</head>

	<body contextmenu="">

		<p>竞拍系统</p>

		<form name="jisuanqi">

			竞拍价格：<input type="text"  name="price"/><br/>

			购买数量：<input type="text"  name="mount"/><br/>

			预计总价：<input type="text" name="total" readonly="readonly" /><br/>

				<input type="button" value="计算总价" onclick="jisuan()"/>

		</form>

	</body>

结果：

aaarticlea/png;base64,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" alt="" /> 解析：获取表单中输入的数据： document.表单名.表单元素名.value；

<script type="text/javascript">

				function jisuan(){

					var grade;  //不同支付方式的折扣

					var f=document.jisuanqi.pay.value;  //拿到select表单元素的值

					var price=document.jisuanqi.price.value;

					var mount=document.jisuanqi.mount.value;

					switch(parseInt(f)){

					case 1: grade=0.8;break;

					case 2: grade=0.9;break;

					case 3: grade=1;break;

					default: alert("重新选择支付方式");

					}

					var total=parseFloat(price)*parseFloat(mount)*grade;

					document.jisuanqi.total.value=total;

				}

		</script>

	</head>

	<body contextmenu="">

		<p>竞拍系统</p>

		<form name="jisuanqi">

			竞拍价格：<input type="text"  name="price" /><br/>

			购买数量：<input type="text"  name="mount"/><br/>

			支付方式:<select name="pay">

					<option  value="1">支付宝/微信</option>

					<option value="2">银行卡</option>

					<option value="3">充值卡</option>

				</select><br/>

			预计总价：<input type="text" name="total" readonly="readonly" /><br/>

				<input type="button" value="计算总价" onclick="jisuan()"/>

		</form>

	</body>

结果：

aaarticlea/png;base64,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" alt="" /> 解析：表单元素中的value 属性可设置或返回密码域的默认值。而在option元素中。value属性设置或返回的是自定义的值，这个自定义的值与用户选择的值一对一对应。

<style type="text/css">

	.aa{

	width:50px;

	height:20px;

	}

</style>

<script>

	function jisuan(op){

		var sum1=document.jisuanqi.num1.value;

		var sum2=document.jisuanqi.num2.value;

		if(op=="jia"){

			var result=parseFloat(sum1)+parseFloat(sum2);

		}else if(op=="jian"){

			var result=parseFloat(sum1)-parseFloat(sum2);

		}else if(op=="cheng"){

			var result=parseFloat(sum1)*parseFloat(sum2);

		}else if(op=="chu"){

			var result=parseFloat(sum1)/parseFloat(sum2);

		}

		document.jisuanqi.result.value=result;

	}

</script>

</head>

<body>

	<p>小型计算器</p>

	<form name="jisuanqi">

	第一个数<input type="text" name="num1" /><br/>

	第二个数<input type="text" name="num2" /><br/><br/>

		<input type="button" value="+" name="plus" class="aa" onclick="jisuan('jia');"/>

		<input type="button" value="-" name="jian" class="aa" onclick="jisuan('jian');"/>

		<input type="button" value="*" name="cheng" class="aa" onclick="jisuan('cheng');"/>

		<input type="button" value="/" name="chu" class="aa" onclick="jisuan('chu');"/><br/><br/>

		计算结果<input type="text" name="result"/>

	</form>

</body>

aaarticlea/png;base64,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" alt="" />

<script type="text/javascript">

		function nameOver(){

			if(document.f.userName.value=="请输入3~8个字符"){  //鼠标移到输入框，清空

				document.f.userName.value="";

			}

		}

		function nameOut(){

			if(document.f.userName.value==""){  //鼠标移开输入框，如果没有输入，提醒输入

				document.f.userName.value="请输入3~8个字符";

			}

		}

		function butOver(){

			document.f.button.value="悬浮";

		}

		function butOut(){

			document.f.button.value="离开";

		}

	</script>

</head>

<body >

<form name="f">

       用户名: <input type="text" value="请输入3~8个字符" name="userName" onMouseOver="nameOver()" onMouseOut="nameOut()"/><br/>

       密 码:<input type="password" name="userPass" /><br/>

      <input type="button" value="正常" onMouseOver="butOver()" name="button"  onMouseOut="butOut()"/>

</form>

</body>

结果：

解析：

用图片代替提交按钮

<script type="text/javascript">

	function submit(){

	document.f.submit();

	}

	</script>

</head>

<body >

	<form name="f">

		 用户名：<input type="text"/><br/>

		密  码：<input type="password" /><br/>

		确认密码：<input type="password" /><br/>

		<input type="image" src="../images/zhuce.jpg" onclick="submit()"/>

	</form>

</body>

结果：

解析：

1. eclipse开发工具下，图片最好放在

相应的文件夹里。

2.表单提交有两种方法：（1） type="submit" 点击按钮即可提交（2）调用表单的submit（）方法。

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（九）javaScript的基本使用

用图片代替提交按钮

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