JS Add Validation page in the Script tab for the presence of jquery file

1Window.onload =function()2 {3 varAl = document.getElementsByTagName ("Script");4 varNew_element=document.createelement ("Script"); 5 varJoine = []6  for(vari = 0; i<al.length; i++)7 {8Joine.push (Al[i].getattribute ("src"));9 }Ten varAjoine = Joine.join (","); One Console.log (ajoine); A if(Indexdemo (Ajoine, ' jquery.min.js ') >0) -     { -Console.log (' 1 '); the         //alert (1); -}Else{ -Console.log (' 2 '); -         varNew_element=document.createelement ("Script");  +New_element.setattribute ("type", "Text/javascript");  -New_element.setattribute ("src", "/static/js/jquery-1.5.1/jquery.min.js");//the introduction of a.js here + Document.body.appendChild (new_element); A         //alert (2); at     } - } -  - functionIndexdemo (str1,str2) { -    varList =str1 -    vars =List.indexof (str2); in    return(s); -}

The Indexdemo () method queries the character.

var ajoine = Joine.join (",");  Method array to String.

Can modify the parameters to achieve their own judgment effect.

JS Add Validation page in the Script tab for the presence of jquery file