基础面试题总结1

介绍sass：

    定义变量css嵌套，允许在代码中使用算式，支持if判断以及for循环

link和@import的区别：

   1. link属于html标签，而@import是css提供的

   2. 页面被加载时，link会同时被加载，而@import被引用的css会等到引用它的CSS文件被加载完再加载

   3. import只在IE5以上才能识别，而link是HTML标签，无兼容问题;

   4. link方式的样式的权重 高于@import的权重.

求以下的输出内容是？

var fun = function(){
    this.name = 'peter';
    return {
    name: 'jack'
    };
}
var p = new fun();
console.log(p.name); // jack
 

var fun = function(){
    this.name = 'peter';
    return 'jack';    
 }
var p = new fun();
console.log(p.name); // peter
 

var fun = function(){}
 
fun.prototype = {
    info : {
    name : 'peter',
    age : 25
    }
}
 
var a = new fun();
var b = new fun();
 
a.info.name = 'jack';
b.info.name = 'tom';
console.log(a.info.name); // tom
console.log(b.info.name); // tom
 

var fun = function(){
    this.info = {
    name : 'peter',
    age : 25
    }
}
var a = new fun();
var b = new fun();
a.info.name = 'jack';
b.info.name = 'tom';
console.log(a.info.name); // jack
console.log(b.info.name); // tom
 

var fun = function(){}
fun.prototype = {    
    name : 'peter',    
    age : 25    
}
var a = new fun();
var b = new fun();
a.name = 'jack';
b.name = 'tom';
console.log(a.name); // jack
console.log(b.name); // tom
 

var fun = function(){
    this.info = {
    name : 'peter',
    age : 25
    }
}
fun.prototype = {
    info : {
    name : 'peter',
    age : 25
    }
}
var a = new fun();
var b = new fun();
a.info.name = 'jack';
b.info.name = 'tom'; 
console.log(a.info.name); // jack
console.log(b.info.name); // tom