发布于 2016-08-28 23:46:22 | 125 次阅读 | 评论: 0 | 来源: 网友投递
jQuery javascript框架
jQuery是一个兼容多浏览器的javascript框架,核心理念是write less,do more(写得更少,做得更多)。jQuery在2006年1月由美国人John Resig在纽约的barcamp发布,吸引了来自世界各地的众多JavaScript高手加入,由Dave Methvin率领团队进行开发。
<a href="javascript:void(0);" onclick="showInfoByName(this.innerHTML);">Tom</a><br/>
<a href="javascript:void(0);" onclick="showInfoByName(this.innerHTML);">Mike</a>
<script type="text/javascript">
var userInfo = [
{
"name": "Tom",
"age": 21,
"phone": "020-12345678"
},
{
"name": "Mike",
"age": 23,
"phone": "020-87654321"
}];
function getDataByName(name)
{
for (var i in userInfo)
{
if (userInfo[i].name == name)
{
return userInfo[i];
break;
}
}
}
function showInfoByName(name)
{
var info = getDataByName(name);
alert('name:' + info.name + '\n' + 'age:' + info.age + '\n' + 'phone:' + info.phone);
}
</script>
<a href="javascript:void(0);" onclick="showInfoByName(this.innerHTML);">Tom</a><br/>
<a href="javascript:void(0);" onclick="showInfoByName(this.innerHTML);">Mike</a>
<script type="text/javascript">
var userInfo =
{
"Tom":
{
"name": "Tom",
"age": 21,
"phone": "020-12345678"
},
"Mike":
{
"name": "Mike",
"age": 23,
"phone": "020-87654321"
}
};
function showInfoByName(name)
{
var info = userInfo[name];
alert('name:' + info.name + '\n' + 'age:' + info.age + '\n' + 'phone:' + info.phone);
}
</script>
<div id="div1">div1</div><br/>
<div id="div2">div2</div>
<script type="text/javascript">
//cache对象结构像这样{"uuid1":{"name1":value1,"name2":value2},"uuid2":{"name1":value1,"name2":value2}},每个uuid对应一个elem缓存数据,每个缓存对象是可以由多个name/value对组成的,而value是可以是任何数据类型的,比如可以像这样在elem下存一个JSON片段:$(elem).data('JSON':{"name":"Tom","age":23})
var cache = {};
//expando作为elem一个新加属性,为了防止与用户自己定义的产生冲突,这里采用可变后缀
var expando = 'jQuery' + new Date().getTime();
var uuid = 0;
function data(elem, name, data)
{
//至少保证要有elem和name两个参数才能进行取缓存或设置缓存操作
if (elem && name)
{
//尝试取elem标签expando属性
var id = elem[expando];
if (data)
{
//设置缓存数据
if (!id)
id = elem[expando] = ++uuid;
//如果cache中id键对象不存在(即这个elem没有设置过数据缓存),先创建一个空对象
if (!cache[id])
cache[id] = {};
cache[id][name] = data;
}
else
{
//获取缓存数据
if (!id)
return 'Not set cache!';
else
return cache[id][name];
}
}
}
var div = document.getElementById('div1');
data(div, "tagName", "div");
data(div, "ID", "div1");
alert(data(div, "tagName")); //div
alert(data(div, "ID")); //div1
var div2 = document.getElementById('div2');
alert(data(div2, "tagName")); //Not set cache!
</script>
remove:function(selector)
{
if (!selector || jQuery.filter(selector, [this]).length)
{
// Prevent memory leaks
jQuery("*", this).add([this]).each(function()
{
jQuery.event.remove(this);
jQuery.removeData(this);
});
if (this.parentNode)
this.parentNode.removeChild(this);
}
}
empty:function()
{
// Remove element nodes and prevent memory leaks
jQuery(this).children().remove();
// Remove any remaining nodes
while (this.firstChild)
this.removeChild(this.firstChild);
}
if (typeof($.data(currentElement)) == 'number')
{
var elemData = $.cache[$.data(currentElement)];
for (var k in elemData)
{
dragingDiv.data(k, elemData[k]);
}
}