javascript - What is the best way to check for XHR2 file upload support? -

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if xhr2 supported file-upload capabilites, application needs different preparation. safe way check if these capabilities supported. sufficient, example, check xmlhttprequest (or ms equivalents) upload property? like...

var xhr = new xmlhttprequest(); if (typeof xhr.upload !== "undefined") {   nice stuff } else {   oldschool stuff }

or not safe?

if (new xmlhttprequest().upload) {   // welcome home! } else {   // not supported }

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