合并对象

1、Object.assign

function custion (options) {
  this.default = {
     width : 100 ,
     height : 100 ,
     color : "red"
  }
  this.settings = Object.assign(this.default , options)
　 console.log(this.settings.width)
  //显示 {width: 200, height: 100, color: "red", background: "red"}
}
custion({
　　width : 200 ,
　　background: "red"
})

2、Jquery中 $.extend：

function custion (options) {
  this.default = {
     width : 100 ,
     height : 100 ,
     color : "red"
  }
  this.settings = $.extend(this.default , options)　 console.log(this.settings.width)    //显示 {width: 200, height: 100, color: "red", background: "red"}
}custion({　　width : 200 ,　　background: "red"})

原文地址：https://www.cnblogs.com/yuyedaocao/p/12045920.html