关于setTimeout/setInterval的第三个参数

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setTimeout(function(obj){
    alert(obj.a);
}, 2000, {a:1});

setTimeout(function(obj){ alert(obj.a); }, 2000, {a:1});

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var arr = [1,9,2,8,3,7,4,6,4,5];
     for(var i = 0, len = arr.length; i < len; i++){
         setTimeout(function(x){
             console.log(x);
         },arr[i],arr[i]);
     }

var arr = [1,9,2,8,3,7,4,6,4,5]; for(var i = 0, len = arr.length; i < len; i++){ setTimeout(function(x){ console.log(x); },arr[i],arr[i]); }

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setTimeout(function(a, b){
    alert(a);
    alert(b);
}, 2000, 1,2);

setTimeout(function(a, b){ alert(a); alert(b); }, 2000, 1,2);

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Function.prototype.delay = function(){
        var args = Array.prototype.slice.call(arguments,0);
        setTimeout(function(fn){
            fn.apply('',args.slice(1));
        },args[0],this);
    }
    var fn = function(x){
        alert(x)
    };
    fn.delay(1000,'xesam');

Function.prototype.delay = function(){ var args = Array.prototype.slice.call(arguments,0); setTimeout(function(fn){ fn.apply('',args.slice(1)); },args[0],this); } var fn = function(x){ alert(x) }; fn.delay(1000,'xesam');