好程序员web前端培训分享前端javascript练习题之闭包案例

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2019-11-28

HTML5 html5培训 web前端培训好程序员

　　好程序员web前端培训分享前端javascript练习题之闭包案例，编写一个求和函数sum，使输入sum(2)(3)或输入sum(2,3)，输出结果相同
可以传入多个参数
function sum(){    
    var num = arguments[0];    
    if(arguments.length==1){       
    return function(sec){           
        return num+sec;       
            }    
        }else{        
        var num = 0;        
        for(var i = 0;i<arguments.length;i++){           
            num = num + arguments[i];        
            }   
            return num;    
        }
    }
递归----深拷贝function deepCopy(obj){
                if(Array.isArray(obj)){
                    var newobj=[];
                }else{
                    var newobj={};
                }
                
                for(var i in obj){
                    if(typeof obj[i]=="object"){
                     newobj[i]=deepCopy(obj[i]);
                        
                    }else{
                        newobj[i]=obj[i];
                    }
                }
                return newobj;
            }
 
定时器案例循环打印5,6,7,8,9,10,9,8,7,6,5,6,7…循环输出
var a=4;
        var b=1;
        setInterval(function(){
            a=a+b;
            if(a==10){
                b=-1;
            }else if(a==5){
                b=1;
            }
            console.log(a);
        },500);
 