<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <script> var array1=new Array(1,2,3,15); var array2=new Array(10,20,30); Array.prototype.sum=function () //array1.sum=function () //相当于行间样式 { var result=0; for(var i=0;i<this.length;i++) //this相当于Arry.prototype { result+=this[i]; } return result; }; alert(array1.sum()); alert(array2.sum()); </script> </head> <body> </body> </html>
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