合并对象

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"
})

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"
})