JS中使用post打开网页

function postUrl(filed,value,url) {
		var doc = document.createElement("form");
		doc.action = url;
		doc.method = "post";
		doc.style.display = "none";

		var opt = document.createElement("textarea");
		opt.name = filed;
		opt.value = value;
		doc.appendChild(opt);

		document.body.appendChild(doc);
		doc.submit();
    });