How do I use wfs-t in ol3?

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I'm using OpenLayers-3.6.0 in a web application. I have wfs layer as follow:

var url="http://localhost:8080/geoserver/wfs?&" + "service=wfs&version=1.1.0&request=GetFeature&typeNames=usa:states";var format = new ol.format.WFS({});var source = new ol.source.Vector({ url: 'proxy.cgi?url='+ encodeURIComponent(url), format: format});layer wfs = new ol.layer.Vector({ title: 'states', source: source});I edit this Point layer as follow:

draw = new ol.interaction.Draw({ source: source, type: 'Point'});Now I want to save this layer in server side. In OpenLayers-2 we defined a saveStrategy and then call save method of it. It is shown as follows:

var saveStrategy = new OpenLayers.Strategy.Save();/** change layer's features*/saveStratefy.save();How can I do it in OpenLayers-3.6.0?



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