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html:
<select name="" id="demo">
<option value="01">吉祥01</option>
<option value="02">吉祥02</option>
<option value="03">吉祥03</option>
<option value="04">吉祥04</option>
<option value="05">吉祥05</option>
</select>
js:
<script>
window.onload = function(){
//获取id为demo的selsction元素
var demo = document.getElementById('demo');
//下拉菜单的改变时间是onchange
demo.onchange = function(){
//onchange触发后执行的代码块儿
alert(this.value);
//可以使用swich语句
switch(this.value){
//如果value的值是01执行语句1
case "01":
语句1;
break;
case "02":
语句2;
break;
case "02":
语句3;
break;
case "04":
语句4;
break;
case "05":
语句5;
break;
//如果上述五个都不满足条件,执行default默认语句,既语句6
default:
语句6;
}
}
}
</script>