var xhr = new XMLHttpRequest();
xhr.open("POST", "http://<your server>/sitecore/api/ssc/item/sitecore%2Fcontent%2Fhome ");
xhr.setRequestHeader("Content-Type", "application/json");
xhr.onreadystatechange = function () {
  if (this.readyState == 4) {
    alert('Status: '+this.status+'nHeaders: '+JSON.stringify(this.getAllResponseHeaders())+'nBody: '+this.responseText);
  }
};
xhr.send("{ n    "ItemName": "Home", n    "TemplateID": "76036f5e-cbce-46d1-af0a-4143f9b557aa", n    "Title": "Sitecore", n    "Text": "\r\n\t\tu003Cpu003EWelcome to Sitecoreu003C/pu003E\r\n" n}");