Wait Until Exists Version v0.2

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.gf.qytechs.cn/scripts/6881/27464/Wait%20Until%20Exists%20Version%20v02.js
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/*
 * 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 = []
  }
})
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