c#吧 关注：188,091贴子：821,591
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<head>
<script type="text/javascript">
function conn() {
var txt1 = document.getElementById("txt1"),
txt2 = document.getElementById("txt2"),
txt3 = document.getElementById("txt3"),
opt = document.getElementById("sele");
txt3.value = eval(txt1.value + opt.value + txt2.value);
}
</script>
<body>
<p>
<lable>第一个数</lable>
</p>
<input type="text" id="txt1" />
<p>
<select id="sele">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
</p>
<lable>第二个数</lable>
<input type="text" id="txt2" />
<br/>
<label>=</label>
<br/>
<lable>答案</lable>
<input type="text" id="txt3" />
<p>
<input type="button" value="计算" onclick="conn()" />
</p>
</body>
<head/>
<script type="text/javascript">
function conn() {
var txt1 = document.getElementById("txt1"),
txt2 = document.getElementById("txt2"),
txt3 = document.getElementById("txt3"),
opt = document.getElementById("sele");
txt3.value = eval(txt1.value + opt.value + txt2.value);
}
</script>
<body>
<p>
<lable>第一个数</lable>
</p>
<input type="text" id="txt1" />
<p>
<select id="sele">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
</p>
<lable>第二个数</lable>
<input type="text" id="txt2" />
<br/>
<label>=</label>
<br/>
<lable>答案</lable>
<input type="text" id="txt3" />
<p>
<input type="button" value="计算" onclick="conn()" />
</p>
</body>
<head/>
