JavaScript 创建对象的七种方式详解

var o1 = new Object();
o1.name = 'Tom';
o1.sing = function() {
 console.log('I am singing');
}

var o2 = {
 "name":"jackson",
 "age":"10",
 "say":function(){
  console.log("say hi");
 };
};

var o3 = function() {
 this.name = "Lucy",
 this.age = "10",
 this.say = function() {
  console.log("say hello");
 }
}

var o4 = function() {}
o4.prototype = {
 "name":"Taylor",
 "age":10,
 "say":function(){
  console.log("say h1");
 }
}

var o5 = function() {
 this.name = 'James';
 this.age = 10;
}
o5.prototype = {
 "say":function() {
   console.log("say hi");
 }
}

// 先要有一个拷贝模块
function extend(target,source){
 for(var k in source){
  target[k] = source[k];
 }
 return target;
};
var o6 = {
 "name":"o6",
 "age":10
}
var o7 = {
 "say":function() {
  console.log('say hi');
 }
}
// o6拷贝o7的方法，然后构建成一个新的对象
var o8 = extend(o6,o7);
o8.say(); // say hi