Javascript open content type

In javascript I have 开发者_运维知识库a string, containing an SpreadsheetML file (excel xml)

I want to open a new window, and write this data to it, but have it open as excel.

Can I do that from javascript?

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Yes, you can do that with a data URL,. First, encode the document as base64. Then, use the following URL as source of your window:

var mtype = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
var url = 'data:' + mtype + ';base64,' + base64data;
window.open(url);

This will require a modern browser.