计算总价钱
<script>
window.onload=function () {
var price=document.myform.price;
var nums=document.myform.nums;
var con=document.myform.con;
nums.onchange=function () {
var aa=nums.selectedIndex+1;
con.value=aa*parseInt(price.value);
}
}
</script>
<form name="myform" id="form1">
<input type="text" name="names" value="搜搜" onfocus="if(this.value=='搜搜') this.value=''" onblur="this.value=this.value==''?'搜搜':this.value">
<input type="button" value="搜索"><br/>
价钱:<input type="text" value="200" name="price">
数量:<select name="nums">
<option>
1个
</option>
<option>
2个
</option>
<option>
3个
</option>
</select>
总价钱:<input type="text" name="con">
</form>