jQuery新窗口打开外链接

$(document).on('click','a',function(){
var url = this.href,hash='';
if(url.indexOf('#')>-1){
hash = !!url.split('#')[1] ? '#' + url.split('#')[1] :'';
url = url.split('#')[0]; 
}
if(url && url.substr(0,4) == 'http' && url.indexOf('caibaojian.')<0 ) {
this.href = url.indexOf('?') > -1 ? url+'&utm_source=caibaojian.'+hash:url+'?utm_source=caibaojian.'+hash;
this.setAttribute('target', '_blank');
}
})