A. jquery 移動端手指拖拽div四個邊框，可上下左右隨意拉伸調節div大小
jQuery拖拽通過八個點改變div大小
js:
(function($) {
/**
* 默認參數
*/
var defaultOpts = {
stage: document, //舞台
item: 'resize-item', //可縮放的類名
};
/**
* 定義類
*/
var ZResize = function(options) {
this.options = $.extend({}, defaultOpts, options);
this.init();
}
ZResize.prototype = {
init: function() {
this.initResizeBox();
},
/**
* 初始化拖拽item
*/
initResizeBox: function() {
var self = this;
$(self.options.item).each(function () {
//創建面板
var width = $(this).width();
var height = $(this).height();
var resizePanel = $('<div class"resize-panel"></div>');
resizePanel.css({
width: width,
height: height,
top: 0,
left: 0,
position: 'absolute',
'background-color': 'rgba(0,0,0,0.5)',
cursor: 'move',
display: 'none'
});
self.appendHandler(resizePanel, $(this));
/**
* 創建控制點
*/
var n = $('<div class="n"></div>');//北
var s = $('<div class="s"></div>');//南
var w = $('<div class="w"></div>');//西
var e = $('<div class="e"></div>');//東
var ne = $('<div class="ne"></div>');//東北
var nw = $('<div class="nw"></div>');//西北
var se = $('<div class="se"></div>');//東南
var sw = $('<div class="sw"></div>');//西南
//添加公共樣式
self.addHandlerCss([n, s, w, e, ne, nw, se, sw]);
//添加各自樣式
n.css({
'top': '-4px',
'margin-left': '-4px',
'left': '50%',
'cursor': 'n-resize'
});
s.css({
'bottom': '-4px',
'margin-left': '-4px',
'left': '50%',
'cursor': 's-resize'
});
e.css({
'top': '50%',
'margin-top': '-4px',
'right': '-4px',
'cursor': 'e-resize'
});
w.css({
'top': '50%',
'margin-top': '-4px',
'left': '-4px',
'cursor': 'w-resize'
});
ne.css({
'top': '-4px',
'right': '-4px',
'cursor': 'ne-resize'
});
nw.css({
top: '-4px',
'left': '-4px',
'cursor': 'nw-resize'
});
se.css({
'bottom': '-4px',
'right': '-4px',
'cursor': 'se-resize'
});
sw.css({
'bottom': '-4px',
'left': '-4px',
'cursor': 'sw-resize'
});
// 添加項目
self.appendHandler([n, s, w, e, ne, nw, se, sw], resizePanel);
//綁定拖拽縮放事件
self.bindResizeEvent(resizePanel, $(this));
//綁定觸發事件
self.bindTrigger($(this));
});
self.bindHidePanel();
},
//控制點公共樣式
addHandlerCss: function(els) {
for(var i = 0; i < els.length; i++) {
el = els[i];
el.css({
position: 'absolute',
width: '8px',
height: '8px',
background: '#ff6600',
margin: '0',
'border-radius': '2px',
border: '1px solid #dd5500',
});
}
},
/**
* 插入容器
*/
appendHandler: function(handlers, target) {
for(var i = 0; i < handlers.length; i++) {
el = handlers[i];
target.append(el);
}
},
/**
* 顯示拖拽面板
*/
triggerResize: function(el) {
var self = this;
el.siblings(self.options.item).children('div').css({
display: 'none'
});
el.children('div').css({
display: 'block'
});
},
/**
* 拖拽事件控制 包含8個縮放點 和一個拖拽位置
*/
bindResizeEvent: function(el) {
var self = this;
var ox = 0; //原始事件x位置
var oy = 0; //原始事件y位置
var ow = 0; //原始寬度
var oh = 0; //原始高度
var oleft = 0; //原始元素位置
var otop = 0;
var org = el.parent('div');
//東
var emove = false;
el.on('mousedown','.e', function(e) {
ox = e.pageX;//原始x位置
ow = el.width();
emove = true;
});
//南
var smove = false;
el.on('mousedown','.s', function(e) {
oy = e.pageY;//原始x位置
oh = el.height();
smove = true;
});
//西
var wmove = false;
el.on('mousedown','.w', function(e) {
ox = e.pageX;//原始x位置
ow = el.width();
wmove = true;
oleft = parseInt(org.css('left').replace('px', ''));
});
//北
var nmove = false;
el.on('mousedown','.n', function(e) {
oy = e.pageY;//原始x位置
oh = el.height();
nmove = true;
otop = parseInt(org.css('top').replace('px', ''));
});
//東北
var nemove = false;
el.on('mousedown','.ne', function(e) {
ox = e.pageX;//原始x位置
oy = e.pageY;
ow = el.width();
oh = el.height();
nemove = true;
otop = parseInt(org.css('top').replace('px', ''));
});
//西北
var nwmove = false;
el.on('mousedown','.nw', function(e) {
ox = e.pageX;//原始x位置
oy = e.pageY;
ow = el.width();
oh = el.height();
otop = parseInt(org.css('top').replace('px', ''));
oleft = parseInt(org.css('left').replace('px', ''));
nwmove = true;
});
//東南
var semove = false;
el.on('mousedown','.se', function(e) {
ox = e.pageX;//原始x位置
oy = e.pageY;
ow = el.width();
oh = el.height();
semove = true;
});
//西南
var swmove = false;
el.on('mousedown','.sw', function(e) {
ox = e.pageX;//原始x位置
oy = e.pageY;
ow = el.width();
oh = el.height();
swmove = true;
oleft = parseInt(org.css('left').replace('px', ''));
});
//拖拽
var drag = false;
el.on('mousedown', function(e) {
ox = e.pageX;//原始x位置
oy = e.pageY;
otop = parseInt(org.css('top').replace('px', ''));
oleft = parseInt(org.css('left').replace('px', ''));
drag = true;
});
$(self.options.stage).on('mousemove', function(e) {
if(emove) {
var x = (e.pageX - ox);
el.css({
width: ow + x
});
org.css({
width: ow + x
});
} else if(smove) {
var y = (e.pageY - oy);
el.css({
height: oh + y
});
org.css({
height: oh + y
});
} else if(wmove) {
var x = (e.pageX - ox);
el.css({
width: ow - x,
// left: oleft + x
});
org.css({
width: ow - x,
left: oleft + x
});
} else if(nmove) {
var y = (e.pageY - oy);
el.css({
height: oh - y,
// top: otop + y
});
org.css({
height: oh - y,
top: otop + y
});
} else if(nemove) {
var x = e.pageX - ox;
var y = e.pageY - oy;
el.css({
height: oh - y,
// top: otop + y,
width: ow + x
});
org.css({
height: oh - y,
top: otop + y,
width: ow + x
});
} else if(nwmove) {
var x = e.pageX - ox;
var y = e.pageY - oy;
el.css({
height: oh - y,
// top: otop + y,
width: ow - x,
// left: oleft + x
});
org.css({
height: oh - y,
top: otop + y,
width: ow - x,
left: oleft + x
});
} else if(semove) {
var x = e.pageX - ox;
var y = e.pageY - oy;
el.css({
width: ow + x,
height: oh + y
});
org.css({
width: ow + x,
height: oh + y
});
} else if(swmove) {
var x = e.pageX - ox;
var y = e.pageY - oy;
el.css({
width: ow - x,
// left: oleft + x,
height: oh + y
});
org.css({
width: ow - x,
left: oleft + x,
height: oh + y
});
} else if(drag) {
var x = e.pageX - ox;
var y = e.pageY - oy;
org.css({
left: oleft + x,
top: otop + y
});
}
}).on('mouseup', function(e) {
emove = false;
smove = false;
wmove = false;
nmove = false;
nemove = false;
nwmove = false;
swmove = false;
semove = false;
drag = false;
});
},
/**
* 點擊item顯示拖拽面板
*/
bindTrigger: function(el) {
var self = this;
el.on('click', function(e) {
e.stopPropagation();
self.triggerResize(el);
});
},
/**
* 點擊舞台空閑區域 隱藏縮放面板
*/
bindHidePanel: function(el) {
var stage = this.options.stage;
var item = this.options.item;
$(stage).bind('click', function() {
$(item).children('div').css({
display: 'none'
});
})
}
}
window.ZResize = ZResize;
})(jQuery);
html:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>jQuery拖拽放大縮小插件idrag</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style type="text/css">
.item1 {
width: 405px;
height: 291px;
cursor: move;
position: absolute;
top: 30px;
left: 30px;
background-color: #FFF;
border: 1px solid #CCCCCC;
-webkit-box-shadow: 10px 10px 25px #ccc;
-moz-box-shadow: 10px 10px 25px #ccc;
box-shadow: 10px 10px 25px #ccc;
}
.item2 {
width: 200px;
height: 100px;
cursor: move;
position: absolute;
top: 400px;
left: 100px;
background-color: #FFF;
border: 1px solid #CCCCCC;
-webkit-box-shadow: 10px 10px 25px #ccc;
-moz-box-shadow: 10px 10px 25px #ccc;
box-shadow: 10px 10px 25px #ccc;
line-height: 100px;
text-align: center;
}
body {
background-color: #F3F3F3;
}
</style>
</head>
<body>
<div id="mydiv" style="width:800px; height:800px; border-style:solid">
<div id="div1" class="resize-item item1">
<img src="images/dog.png" width="100%" height="100%">
</div>
<div class="resize-item item2">
你是我的小小狗
</div>
</div>
<script src="jquery.min.js"></script>
<script type="text/javascript" src='jquery.ZResize.js'></script>
<script type="text/javascript">
new ZResize({
stage: "#mydiv", //舞台
item: '#div1', //可縮放的類名
});
</script>
</body>
</html>
B. javascript中使用attachEvent添加了匿名函數事件，如何用detachEvent移除這個事件
做這種東西，建議你用js庫去做,
或者你不想用jQuery這種體積龐大的庫(也不算大，最新版本80多k,可以壓縮到50多k)
可以用CJL這種小庫，對原生的js做了些基本的兼容.體積只有6k不到.
再或者你自己封裝些常用的兼容，方法.
看下我這個愛牆的拖動怎麼樣?
http://shirne.com/love
下面是我以前寫的拖動插件,不明白的地方隨時找我.
//用法$("id1").startDrag($("id2"));
//id1為滑鼠啟用效果的元素,id2為移動的元素
//例如，有一個div元素，內有一個h2標簽作為這個div版塊的標題.就可以在h2上啟用拖動來移
//動div元素,而在div內的其它地方則不啟用拖動
var d=document;
d.addListener=function(e,f,b){
this.attachEvent?this.attachEvent('on'+e,f):this.addEventListener(e,f,b);
}
d.removeListener=function(e,f,b){
this.detachEvent?this.detachEvent('on'+e,f):this.removeEventListener(e,f,b);
}
function $(){
var o=document.getElementById(arguments[0]);
o.addListener=function(e,f,b){
this.attachEvent?this.attachEvent('on'+e,f):this.addEventListener(e,f,b);
}
o.removeListener=function(e,f,b){
this.detachEvent?this.detachEvent('on'+e,f):this.removeEventListener(e,f,b);
}
o.startDrag=function(obj){
var obj=obj?obj:o;
var sx,sy;
o.style.cursor="move";
o.addListener("mousedown",function(e){
e||event;
if(e.button==1||e.button==0){
sx=e.clientX-obj.offsetLeft;sy=e.clientY-obj.offsetTop;
d.addListener("mousemove",move,false);
d.addListener("mouseup",stopDrag,false);
}
},false);
var stopDrag=function(){
d.removeListener("mousemove",move,false);
d.removeListener("mouseup",stopDrag,false);
}
var move=function(e){
e||event;
window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
if(e.preventDefault)e.preventDefault();
with (obj.style){
position="absolute"
left=e.clientX-sx+"px";
top=e.clientY-sy+"px";
}
}
}
return o;
}
要移除事件監聽，除了用函數名外，還可以用索引。
如：delete element.events[type][0]
除非你十分確定，否則用索引刪除可能會出問題
C. javascript給一個html標簽添加onmouseover事件。
推薦使用jQuery，直接執行方法$("#id").mouseover(function(){});
完全使用js則是如版下寫法：權document.getElementById("id").onmouseover=function(){};