1.  Fat arrow function syntax

•  fat arrow 即:  '=>'   
• 通常我们在调用一个方法里带有一个function作为参数时我们一般这样用：

var data = ['Alice Green', 'Paul Pfifer', 'Louis Blakenship'];data.forEach(function(line) { console.log(line); });

•  现在我们可以使用这种 fat arrow "=>" ，于是上面科一这样写：

// Typescript examplevar data: string[] = ['Alice Green', 'Paul Pfifer', 'Louis Blakenship'];data.forEach( (line) => console.log(line) );

•  另一个 => 的特性就是 他可以为其上文的代码公用一个  this ，例如：

/***********ES5**************/var nate = {name: "Nate",guitars: ["Gibson", "Martin", "Taylor"],printGuitars: function() {var self = this;this.guitars.forEach(function(g) {// this.name is undefined so we have to use self.nameconsole.log(self.name + " plays a " + g);});}};/***********ES6**************/var nate = {name: "Nate",guitars: ["Gibson", "Martin", "Taylor"],printGuitars: function() {this.guitars.forEach( (g) => {console.log(this.name + " plays a " + g);});}};

         2、Template Strings

• Variables within strings (without being forced to concatenate with + ) and
• Multi-line strings

  //usagevar firstName = "Nate";var lastName = "Murray";// interpolate a stringvar greeting = `Hello ${firstName} ${lastName}`;console.log(greeting);var template = `
        
         
  Hello
         
  This is a great website
        
  `