Detailed explanation of js to determine whether the client can access the Internet

This article mainly introduces js to determine whether the client can access the Internet in detail. Friends in need can refer to it.

The first one:

<script src="http://code.jquery.com/jquery-1.4.2.min.js"></script>
<script language="javascript" type="text/javascript">
   if(!window.jQuery){
         alert("能上网");
    }else{
      alert("不能上网");
  }

The second one:

Use js to cross domain Do

$.getScript("http://api.taobao.com/apitools/ajax_props.do?act=props&cid=50000436&restBool=false", function () {

//Put Some codes that can only be done online

);

or

//Cross-domain (can cross all domain names)
$.getJSON("http:// e.hnce.com.cn/tools/ajax.aspx?jsoncallback=?", { id: 0, action: 'jobcategoryjson' }, function(json) {

alert(json[0].pid );
alert(json[0].items[0]._name);

});

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js determines whether it is PC or mobile

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