Javascript动态伸缩+淡出淡入_javascript技巧

//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

<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>缂╁</title>