建站常识

方案一：

<select id="test_select">

<option value="1">显示</option>

<option value="2">隐藏</option>

</select>

<div id="test">www.my0553.cn</div>

window.onload = function(){

var obj_select = document.getElementById("test_select");

var obj_div = document.getElementById("test");

obj_select.onchange = function(){

obj_div.style.display = this.value==1? "block" : "none";

}

}

方案二：

function choose(sel){

if(sel.value=='1')

{

document.getElementById('test').style.display='block';

}

else if(sel.value=='2')

{

document.getElementById('test').style.display='none';

}

};

<div id="test">www.my0553.cn</div>

<select name="sel"  onchange='choose(this);'>

<option value="1">A</option>

<option value="2">B</option>

</select>