1、实现一个克隆方法

function clone(temp) {    var globalTemp;    switch (typeof temp) {        case 'null':            globalTemp = temp;            break;        case 'string':            globalTemp = temp;            break;        case 'number':            globalTemp = temp;            break;        case 'undefined':            globalTemp = temp;            break;        case "boolean":            globalTemp = temp;            break;        case 'object':            if (temp instanceof Array) {                globalTemp = [];                for (var i = 0; i < temp.length; i++) {                    globalTemp.push(clone(temp[i]));                }            } else {                globalTemp = {};                for(var key in temp) {                    globalTemp[key] = clone(temp[key]);                }            }            break;        default: break;    }    return globalTemp;}

2、数组去重

function clearArr(arr) {    var arr2 = [];    if (arr instanceof Array) {        for(var i = 0,len = arr.length; i< len; i++){            if (arr2.indexOf(arr[i]) < 0)  {                arr2.push(arr[i]);            }        }        return arr2;    } else {        return false;    }}