javascript 擷取網站根地址（URL）

/** * 擷取網站根地址，如果是虛擬目錄則帶有虛擬目錄名 * @param isVirtual 是否虛擬目錄 * @returns {String} */function getSiteRoot(isVirtual) {var siteRoot = window.location.protocol +"//"+ window.location.host +"/";if(!isVirtual) return siteRoot;var relativePath = window.location.pathname;if(relativePath != "" && relativePath.substring(0,1) == "/"){//此處重要，不同的瀏覽器可能返回的relativePath不一樣relativePath = relativePath.substring(1);}var virtualPath = (relativePath == "") ? "" : relativePath.substring(0, relativePath.indexOf("/") + 1);return siteRoot + virtualPath;}