//interval变量
var inl = [];
//原始透明度
var opa = 100;
//判断浏览器
var ie = navigator.appname == microsoft internet explorer ? microsoft internet explorer : ;
//缩小和打开按纽
function gogo() {
speed = 50;
var mode;
//利用方块的display来判定是否缩小或放大
if(!$('tmp').style.display) {
mode = -;
//display是正常的话设置interval缩小
inl['suotu'] = setinterval(suodi('-'), 10);
}else {
mode = +;
//display是none的话先把display改回去正常，再设置interval放大
$('tmp').style.display = ;
inl['suotu'] = setinterval(suodi('+'), 10);
}
clearinterval(inl['dcdr']);
inl['dcdr'] = setinterval(dcdr(' + mode + '), 10);
}
//淡出淡入
function dcdr(op) {
//获取透明度
opa = define(op, opa, 4, 0, 100);
//更新透明度
ie ? $('tmp').style.filter = alpha(opacity= + opa + ) : $('tmp').style.opacity = opa / 100;
//如果透明度小于等于0或大于等于100
if(opa = 100) {
//停止interval
clearinterval(inl['dcdr']);
}
}
function define(id, a, b, a2, a3) {
if(id == -) {
a -= b;
if(a a = a2;
}
}else {
a += b;
if(a >= a3) {
a = a3;
}
}
return a;
}
//缩小或放大
function suodi(opt) {
//速度大于1的话继续除以s，否则等于1
speed = speed > 1 ? speed * 0.862 : 1;
//获取高度
var hw = define(opt, $('tmp').clientheight, speed, speed, 300);
//设定高度和宽度
$('tmp').style.height = hw + px;
$('tmp').style.width = hw + px;
//假如方块的高度小于速度
if($('tmp').clientheight //隐藏方块
$('tmp').style.display = none;
//按钮名字改为打开
$('anniu').value = 打开;
//关闭interval
clearinterval(inl['suotu']);
}else if($('tmp').clientwidth >= 300) {
//按钮名字改为缩小
$('anniu').value = 缩小;
//关闭interval
clearinterval(inl['suotu']);
}
}
//简化getelementbyid为$
var $ = function($) {
return document.getelementbyid($);
}
//interval变量
var inl = [];
//原始透明度
var opa = 100;
//判断浏览器
var ie = navigator.appname == microsoft internet explorer ? microsoft internet explorer : ;
//缩小和打开按纽
function gogo() {
speed = 50;
var mode;
//利用方块的display来判定是否缩小或放大
if(!$('tmp').style.display) {
        mode = -;
        //display是正常的话设置interval缩小
inl['suotu'] = setinterval(suodi('-'), 10);
}else {
        mode = +;
        //display是none的话先把display改回去正常，再设置interval放大
$('tmp').style.display = ;
inl['suotu'] = setinterval(suodi('+'), 10);
}
    clearinterval(inl['dcdr']);
    inl['dcdr'] = setinterval(dcdr(' + mode + '), 10);
}
//淡出淡入
function dcdr(op) {
    //获取透明度
    opa = define(op, opa, 4, 0, 100);
//更新透明度
    ie ? $('tmp').style.filter = alpha(opacity= + opa + ) : $('tmp').style.opacity = opa / 100;
//如果透明度小于等于0或大于等于100
    if(opa = 100) {
        //停止interval
        clearinterval(inl['dcdr']);
    }
}
function define(id, a, b, a2, a3) {
    if(id == -) {
        a -= b;
        if(a             a = a2;
        }
    }else {
        a += b;
        if(a >= a3) {
            a = a3;
        }
    }
    return a;
}
//缩小或放大
function suodi(opt) {
    //速度大于1的话继续除以s，否则等于1
speed = speed > 1 ? speed * 0.862 : 1;
//获取高度
    var hw = define(opt, $('tmp').clientheight, speed, speed, 300);
//设定高度和宽度
$('tmp').style.height = hw + px;
$('tmp').style.width = hw + px;
    //假如方块的高度小于速度
if($('tmp').clientheight      //隐藏方块
$('tmp').style.display = none;
        //按钮名字改为打开
$('anniu').value = 打开;
        //关闭interval
clearinterval(inl['suotu']);
}else if($('tmp').clientwidth >= 300) {
        //按钮名字改为缩小
        $('anniu').value = 缩小;
        //关闭interval
        clearinterval(inl['suotu']);
    }
}
//简化getelementbyid为$
var $ = function($) {
return document.getelementbyid($);
}
演示
缂╁