基于Javascript实现二级联动菜单效果

本文实例为大家分享了Javascript实现二级联动菜单效果的对应代码,具体内容如下

效果图如下:

具体实现步骤如下:

1.所用js代码如下:

<script type="text/javascript">

var arr_province=["请选择省份/城市","北京市","上海市","天津市","河南省","山东省","河北省"];

var arr_city=[

["请选择城市/地区"],

["中关村","海淀区","朝阳区","昌平区","丰台区","大兴区"],

["宝坻区","浦东新区","长宁区","徐汇区","虹口区","宝山区"],

["和平区","河东区","河西区","塘沽区","大港区","北辰区"],

["郑州市","洛阳市","商丘市","开封市","安阳市","濮阳市"],

["济南市","青岛市","烟台市","德州市"],

["石家庄","菏泽市","唐山市"],

];

function init()

{

var province=document.form1.province;

province.style.width=150+"px";

var city=document.form1.city;

city.style.width=150+"px";

//给province赋值高度,才能在其里面写入内容

province.length=arr_province.length;

for(var i=0;i<arr_province.length;i++)

{

province.options[i].text=arr_province[i];

province.options[i].value=arr_province[i];

}

//设置默认被选中的选项

var index=0;

province.selectedIndex=index;

//给city赋值高度,才能在其里面写入内容

city.length=arr_city[index].length;

for(var j=0;j<arr_city[index].length;j++)

{

city.options[j].text=arr_city[index][j];

city.options[j].value=arr_city[index][j];

}

}

function select_change(num)

{

var city=document.form1.city;

city.length=0;

city.length=arr_city[num].length;

for(var i=0; i<arr_city[num].length;i++)

{

city.options[i].text=arr_city[num][i];

city.options[i].value=arr_city[num][i];

}

}

</script>

2.body中的代码如下:

<body onload="init()">

<form name="form1">

所在地区:<select name="province" onchange="select_change(this.selectedIndex)"></select>

城市:<select name="city"></select>

</form>

</body>

第二个效果:

1.利用javascript来实现鼠标经过图片放大,鼠标移出图片恢复的效果,具体代码如下:

<script type="text/javascript">

function init()

{

var img0=document.getElementById("img0");

img0.onmouseover=function()

{

img0.style.width=img0.offsetWidth*1.5+"px"

}

img0.onmouseout=function()

{

img0.style.width=img0.offsetWidth/1.5+"px"

}

}

</script>

2.body中的代码如下:

<body onload="init()">

<img id="img0" src="images/4.jpg" />

</body>

以上是 基于Javascript实现二级联动菜单效果 的全部内容, 来源链接: utcz.com/z/334133.html

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