//判断是否已经引入js
function isInclude(name){
var js= /js$/i.test(name);
var es=document.getElementsByTagName(js?'script':'link');
for(var i=0;i<es.length;i++)
if(es[i][js?'src':'href'].indexOf(name)!=-1)return true;
return false;
}
if (!isInclude("swiper.js")) {
var oHead = document.getElementsByTagName('HEAD').item(0);
var oScript = document.createElement("script");
oScript.type = "text/javascript";
oScript.src = "js/swiper.js";
}