Introduction to javascript anonymous function application examples_javascript skills

JavaScript anonymous function means that the function has no name. The test code is listed below. 🎜>
/*

* Generally common functions are like this */ function debug(data) { console.log(data); }

But some functions are written like this

Copy the code


The code is as follows:

(function(x, y) {

debug(x y); }) The above is the so-called anonymous function

Copy code


The code is as follows:

var fun = null;

(function() { var test = function(x ,y ) { debug(x y); } fun =test; })();

At this time, you enter in the browser console fun, you will find that it prints function(x, y){ debug(x y);}. It is obvious that this is a function. If you enter fun(1, 2);, 3 will be printed at this time. Let’s look at the types below.




Copy code


The code is as follows:

var U = {

uid: 32812, gameList: (function(){ var list = new Array(); list[7]= '360'; list[6]='baidu'; if(list != 'null'){ return list;

}

}
)(),
serverList: (function(){
var list = new Array();
list[1188]='360';
list[1165]='baidu';
if(list != 'null'){
return list;
}
}
)(),
channelList: (function(){
var list = new Array();
list[9]='手机游戏网';
return list;
}
)(),
searchName : function(t,id){
if( id == false || /^d $/.test(id) == false ){
return 'This is a function';
}else if(eval(t).hasOwnProperty(id)){
return eval(t)[id];
}else{
return 'test ';
}
}
};


At this time, you enter U in the console; you will find that this is an array. U['searchName '] is a function, and U['qudaoList'] returns a result.