一、JAVASCRIPT：

1. 代码：

   var test = function (){
   this.str = '',
   this.a = function (){
       this.str += "a"
       return this
   },
   this.b = function(){
       this.str += "b"
       return this
   }
   this.out = function(){
       console.log(this.str)
   }
   }
   var entity = new test()
   entity.a().b().out()

2. 输出：

   ab

   二、PHP：

3. 代码：

   out .= $a;
       return $this;
   }
   public function b($b){
       $this->out .= $b;
       return $this;
   }
   public function say(){
       echo $this->out.PHP_EOL;
   }
   public function get(){
       return $this->out;
   }
   }
   $single = new single();
   $out = $single->a('a')->b('b')->say();
   $get = $single->a('a')->b('b')->get();
   echo $get;

4. 输出：

   ab
   abab

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