1.传入一个string类型的参数,然后将string的每个字符间加个空格返回
1 String.prototype.spacify = function(){ 2 return this.split("").join(" "); 3 }; 4 console.log("abc".spacify()); //a b c
2.将数组[1,2,3,4,5]变为[1,2,3,4,5,1,2,3,4,5]
1 Array.prototype.duplicator = function(){ 2 return this.concat(this);7 8 console.log([1,2,3,4,5].duplicator()); //[1,2,3,4,5,1,2,3,4,5]
3.输出参数,且加上规定的前缀
1 function log(){ 2 var str = Array.prototype.slice.call(arguments); 3 str.unshift("(app)"); 4 console.log.apply(console,str); 5 } 6 log("hello","world"); //(app) hello world
4.接收一个整数作为字符串重复的次数,返回重复的字符串
1 String.prototype.repeatify = String.prototype.repeatify || function (num){ 2 var str = ""; 3 for (var i = 0; i < num; i++){ 4 str +=this; 5 } 6 return str; 7 }; 8 console.log("hello".repeatify(3)); //hellohellohello
5.变为驼峰式
1 var foo = "get-element-by-id"; 2 function como(str){ 3 var arr = str.split("-"); 4 var elem; 5 var newArr = [arr[0]]; 6 for(var i =1,len = arr.length; i < len; i++){ 7 elem = arr[i]; 8 elem = elem.charAt(0).toUpperCase()+elem.slice(1,elem.length); 9 newArr.push(elem); 10 } 11 return newArr.join(""); 12 } 13 console.log(como(foo)); //getElementById