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<!DOCTYPE html> <head> <meta charset="utf-8"> <script src="https://d3js.org/d3.v4.min.js"></script> <style> body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } </style> </head> <body> <script> function checkName(name){ try{ if(typeof name === "undefined"){ throw new Error("Name is missing. Can't say hello!"); } showSuccessMessage(name); }catch(err){ logErrorMessage(err); } } function showSuccessMessage (name){ alert('Hello, ' + name + '!'); } function logErrorMessage (err){ console.log(err.message); } checkName(); checkName("Fabian"); </script> </body>
https://d3js.org/d3.v4.min.js