自动分号插入 ASI

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 1 // call 与 apply
 2         // 构造形状类
 3         function Sharp(name){
 4             this.name = name
 5         }
 6         Sharp.prototype.area = function(l,w) {
 7                 console.log(this.l*this.w)
 8             }
 9 
10         function Circle(name){
11             Sharp.call(this,name)
12         }
13         Circle.prototype.area = function (r) {
14             console.log(Math.PI*r*r)
15         }
16         var c1 = new Circle('圆')
17         c1.name
18         c1.area(5)