Ecmascript 6 visual studio

I need help how to setup Visual Studio 2013 express, so can work with the new javascript syntax. As I see, the intellisense work very good, but the problem is when I load html page with js code in browser.

For example, the code below does not make visible the canvas, problem with LET keyword, if I change with VAR then everything is ok.

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  •  let canvas = document.createElement("canvas");
       canvas.setAttribute("width", "256");
       canvas.setAttribute("height", "256"); = "1px dashed black";
       let ctx = canvas.getContext("2d");
       ctx.moveTo(0, 0);
       ctx.lineTo(200, 100);

    Can someone help how to configure visual studio.

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