/**
* window.onresize 事件 專用事件綁定器 v0.1 Alucelx
* http://www.cnblogs.com/Alucelx/archive/2011/10/20/2219263.html
* <description>
* 用于解決 lte ie8 & chrome 及其他可能會(huì)出現(xiàn)的 原生 window.resize 事件多次執(zhí)行的 BUG.
* </description>
* <methods>
* add: 添加事件句柄
* remove: 刪除事件句柄
* </methods>
*/
var onWindowResize = function(){
//事件隊(duì)列
var queue = [],
indexOf = Array.prototype.indexOf || function(){
var i = 0, length = this.length;
for( ; i < length; i++ ){
if(this[i] === arguments[0]){
return i;
}
}
return -1;
};
var isResizing = {}, //標(biāo)記可視區(qū)域尺寸狀態(tài)， 用于消除 lte ie8 / chrome 中 window.onresize 事件多次執(zhí)行的 bug
lazy = true, //懶執(zhí)行標(biāo)記
listener = function(e){ //事件監(jiān)聽器
var h = window.innerHeight || (document.documentElement && document.documentElement.clientHeight) || document.body.clientHeight,
w = window.innerWidth || (document.documentElement && document.documentElement.clientWidth) || document.body.clientWidth;
if( h === isResizing.h && w === isResizing.w){
return;
}else{
e = e || window.event;
var i = 0, len = queue.length;
for( ; i < len; i++){
queue[i].call(this, e);
}
isResizing.h = h,
isResizing.w = w;
}
}
return {
add: function(fn){
if(typeof fn === 'function'){
if(lazy){ //懶執(zhí)行
if(window.addEventListener){
window.addEventListener('resize', listener, false);
}else{
window.attachEvent('onresize', listener);
}
lazy = false;
}
queue.push(fn);
}else{ }
return this;
},
remove: function(fn){
if(typeof fn === 'undefined'){
queue = [];
}else if(typeof fn === 'function'){
var i = indexOf.call(queue, fn);
if(i > -1){
queue.splice(i, 1);
}
}
return this;
}
};
}.call(this);

var _fn = function(){document.body.innerHTML += "1"};
onWindowResize.add(_fn)
.add(function(){document.body.innerHTML += "2"})
.add(function(){document.body.innerHTML += "3"})
.remove(_fn);