发布于 2017-02-20 04:44:46 | 97 次阅读 | 评论: 0 | 来源: 网友投递
这里有新鲜出炉的Javascript教程，程序狗速度看过来！
JavaScript客户端脚本语言
Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言，主要目的是为了解决服务器端语言，比如Perl，遗留的速度问题，为客户提供更流畅的浏览效果。
本文实例讲述了JS实现的仿QQ空间图片弹出效果代码。分享给大家供大家参考，具体如下：
<script type="text/javascript">
function imageShow(which_click) {
var image_path = which_click;
//alert(image_path);
var tag_top = Math.max(document.documentElement.scrollTop, document.body.scrollTop);
//创建底层灰色DIV
var index_tag = document.createElement("div");
index_tag.style.cssText = "width:100%;height:"+Math.max(document.body.clientHeight,document.body.offsetHeight,document.documentElement.clientHeight)+"px;position:relative;background:black;top:0;filter: Alpha(Opacity=80);Opacity:0.8;";
document.body.appendChild(index_tag);
//index_tag.ondblclick = closeIndexTag;
index_tag.onclick = closeIndexTag;
//创建图片DIV
var img_tag = document.createElement("div");
img_tag.style.cssText = "font:12px/18px verdana;overflow:auto;text-align:center;position:absolute;width:200px;border:5px solid white;background:white;color:white;left:"+(parseInt(document.body.offsetWidth)/2-100)+"px;top:"+(document.documentElement.clientHeight/3+tag_top)+"px;";
img_tag.innerHTML = "<div style='padding:10px;background:#cccccc;border:1px solid white'><img src='images/loading.gif' /><br /><br /><b style='color:#999999;font-weight:normal'>Image loading...</b><br /></div>";
img_tag.oncontextmenu = function() {
var clsOK=confirm("是否确定关闭图片显示");
if(clsOK)
closeIndexTag();
return false;
}
img_tag.onclick = closeIndexTag;
//img_tag.onmousemove = barDidplay;
document.body.appendChild(img_tag);
//构建图片关闭按钮
var close_tag = document.createElement("div");
close_tag.style.cssText = "display:none;position:absolute;left:10px;top:10px;color:black;";
close_tag.innerHTML = "<b style='background:none;border:0px solid white;filter:Alpha(Opacity=50);Opacity:0.5;cursor:pointer;'> 关闭 </b>";
close_tag.onclick = closeIndexTag;
var img = new Image();
img.src = image_path;
img.style.cssText = "border:1px solid #cccccc;filter: Alpha(Opacity=0);Opacity:0;cursor:pointer";
img.onload = imgOK();
function imgOK() {
var temp = 0;
var stop_x = false;
var stop_y = false;
var img_tag_x = img_tag.offsetWidth;
var img_tag_y = img_tag.offsetHeight;
var img_x = img.width;
var img_y = img.height;
var scroll_x=document.documentElement.clientWidth;
var scroll_y=window.innerHeight||document.documentElement.clientHeight;
var yy = 0;
var xx = 0;
if(img_y > scroll_y || img_x > scroll_x){
yy = scroll_y - 100;
xx = (img_x / img_y) * yy;
}else{
xx = img_x + 4;
yy = img_y + 3;
}
img.style.width=xx-4+'px';
img.style.height=yy-3+'px';
var maxTime = setInterval(function() {
temp += 30;
if((img_tag_x + temp) < xx) {
img_tag.style.width = (img_tag_x + temp) + "px";
img_tag.style.left = (scroll_x - img_tag_x - temp)/2 + "px";
} else {
stop_x = true;
img_tag.style.width = xx + "px";
img_tag.style.left = (scroll_x - xx)/2 + "px";
}
if((img_tag_y + temp) < yy) {
img_tag.style.height = (img_tag_y + temp) + "px";
img_tag.style.top = (tag_top + (scroll_y - img_tag_y - temp)/2) + "px";
} else {
stop_y = true;
img_tag.style.height = yy + "px";
img_tag.style.top = (tag_top + (scroll_y - yy)/2) + "px";
}
if(stop_x && stop_y) {
clearInterval(maxTime);
img_tag.appendChild(img);
temp = 0;
imgOpacity(temp);
}
}, 1);
img_tag.innerHTML="";
img_tag.appendChild(close_tag);
}
function closeIndexTag() {
document.body.removeChild(index_tag);
document.body.removeChild(img_tag);
}
function imgOpacity(temp_imgOpacity) {
var temp = temp_imgOpacity;
temp += 10;
img.style.filter = "alpha(opacity=" + temp + ")";
img.style.opacity = temp/100;
var imgTime = setTimeout(function() {imgOpacity(temp);}, 10);
if(temp > 100)
clearTimeout(imgTime);
}
var bar_show;
function barDidplay(){
clearTimeout(bar_show);
close_tag.style.display = "block";
bar_show = setTimeout(function() {close_tag.style.display = "none"}, 1000);
}
}
</script>
html部分：
<a class="add" href="javascript:;" onclick="imageShow('img/hn_bg.jpg')">
<span>图片效果</span>
</a>
希望本文所述对大家JavaScript程序设计有所帮助。