js获取表单里的参数并返回键值对

/**
 * js获取表单里的参数并返回键值对
 * @version 1
 * @param {Object} - js表单对象
 * @returns {Object} - 表单参数键值对
 */
function getFormData(form){
	if (!form) {
		return {};
	}
	var params = {}
		, elems = form.elements
		;
	for(var i in elems){
		var elem = elems[i];
		if(elem.nodeName != "INPUT"){
			continue;
		}
		var nodeAttrs = elem.attributes;
		if(nodeAttrs.name){
			params[nodeAttrs.name.nodeValue] = elem.value;
		}
	}
	return params;
}
// eg
var p = getFormData(document.forms[0]);
// p.a = 1
// p.b = 2
// p.c = 3