A faster way than document ready
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.org/scripts/6881/27464/Wait%20Until%20Exists%20Version%20v02.js
/*
* Wait Until Exists Version v0.2 - http://javascriptisawesome.blogspot.com/
*
*
* TERMS OF USE - Wait Until Exists
*
* Open source under the BSD License.
*
* Copyright © 2011 Ivan Castellanos
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* Neither the name of the author nor the names of contributors may be used to endorse
* or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
(function(){
var _waitUntilExists = {
pending_functions : [],
loop_and_call : function()
{
if(!_waitUntilExists.pending_functions.length){return}
for(var i=0;i<_waitUntilExists.pending_functions.length;i++)
{
var obj = _waitUntilExists.pending_functions[i];
var resolution = document.getElementById(obj.id);
if(obj.id == document){
resolution = document.body;
}
if(resolution){
var _f = obj.f;
_waitUntilExists.pending_functions.splice(i, 1)
if(obj.c == "itself"){obj.c = resolution}
_f.call(obj.c)
i--
}
}
},
global_interval : setInterval(function(){_waitUntilExists.loop_and_call()},5)
}
if(document.addEventListener){
document.addEventListener("DOMNodeInserted", _waitUntilExists.loop_and_call, false);
clearInterval(_waitUntilExists.global_interval);
}
window.waitUntilExists = function(id,the_function,context){
context = context || window
if(typeof id == "function"){context = the_function;the_function = id;id=document}
_waitUntilExists.pending_functions.push({f:the_function,id:id,c:context})
}
waitUntilExists.stop = function(id,f){
for(var i=0;i<_waitUntilExists.pending_functions.length;i++){
if(_waitUntilExists.pending_functions[i].id==id && (typeof f == "undefined" || _waitUntilExists.pending_functions[i].f == f))
{
_waitUntilExists.pending_functions.splice(i, 1)
}
}
}
waitUntilExists.stopAll = function(){
_waitUntilExists.pending_functions = []
}
})