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   function is(e, handler) {  
    if (e.type != 'mouseout' && e.type != 'mouseover') return false;  
   var reltg = e.relatedTarget ? e.relatedTarget : e.type == 'mouseout' ? e.toElement : e.fromElement;  
    while (reltg && reltg != handler)  
        reltg = reltg.parentNode;  
    return (reltg != handler);  
}
   var menu=function(obj){
    var div=document.createElement("div");
    div.style.position="absolute";
    div.style.left="-1000px";
    div.style.top="0px";
    div.flag="menu"
    document.body.appendChild(div);
    div.onmouseout=function(e){
     
     var e=e||window.event;
     if(!is(e,this)) return;
        e=e.relatedTarget?e.relatedTarget:e.toElement;
        if(e.flag!="menu"){
         div.style.left="-1000px";
       div.style.top="0px"
        }
    }
    function exec(obj,div){
     var a;
     for(a in obj){
      var item=document.createElement("div");
       item.flag="menu";
      item.style.textAlign="center";
      item.in


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var a = "hello";
var b = ",world";
var c = a.concat(b);
alert(c);
//c = "hello,world"
indexOf
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var student={
name:"leo",
intro:function(){
alert("my name is "+this.name);
}
}
var teacher=function(f){
f();
}
teacher(student.intro); 
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