从url获取参数

/**
 * 获取url参数值
 */
function getQueryString(name) { 
		var reg = new RegExp("(^|&|&%20)" + name + "=([^&]*)(&|$)", "i"); 
		var r = window.location.search.substr(1).match(reg); 
		if (r != null) return unescape(r[2]);
		 return null; 
	} 

  window.location.href="copyAddVehicle.html?vd="+vehicleid;

var equipid = getQueryString("vd");