i can't understand why just the first function ($("#ContentWel")) works.
But if I put the second function ("#ContentCan") in the first place it only works:
$(document).ready(function(){
    $("#ContentWel").hover(function(){
    $('#counter开发者_开发问答image').attr('src', 'img/01.png');
    });
    $("#ContentCan").hover(function(){
    $('#counterimage').attr('src', 'img/02.png');
    });
    $("#ContentCli").hover(function(){
    $('#counterimage').attr('src', 'img/03.png');
    });
    $("#ContentTesti").hover(function(){
    $('#counterimage').attr('src', 'img/04.png');
    });
    $("#ContentCont").hover(function(){
    $('#counterimage').attr('src', 'img/05.png');
    });
    $("#ContentPri").hover(function(){
    $('#counterimage').attr('src', 'img/06.png');
    });
});
Thanks, Guilherme
.hover() need a mouseenter and mouseleave function
$("#ContentWel").hover(function(){
    $('#counterimage').attr('src', 'img/01.png');
 }, function(){
    // something else happens
});
or you just use mouseenter:
$("#ContentWel").mouseenter(function(){
    $('#counterimage').attr('src', 'img/01.png');
});
To gain more visibility into your functions add try/catches
try {
 $("#ContentWel").hover(function(){
    $('#counterimage').attr('src', 'img/01.png');
    });
 } catch (e) { if (window.console !== undefined && window.console.log !== undefined) { window.console.log(e.message); } else { alert(e.message); } }
 try {
    $("#ContentCan").hover(function(){
    $('#counterimage').attr('src', 'img/02.png');
    });
 } catch (e) { if (window.console !== undefined && window.console.log !== undefined) { window.console.log(e.message); } else { alert(e.message); } }
 try {
    $("#ContentCli").hover(function(){
    $('#counterimage').attr('src', 'img/03.png');
    });
 } catch (e) { if (window.console !== undefined && window.console.log !== undefined) { window.console.log(e.message); } else { alert(e.message); } }
 try {
    $("#ContentTesti").hover(function(){
    $('#counterimage').attr('src', 'img/04.png');
    });
 } catch (e) { if (window.console !== undefined && window.console.log !== undefined) { window.console.log(e.message); } else { alert(e.message); } }
 try {
    $("#ContentCont").hover(function(){
    $('#counterimage').attr('src', 'img/05.png');
    });
 } catch (e) { if (window.console !== undefined && window.console.log !== undefined) { window.console.log(e.message); } else { alert(e.message); } }
 try {
    $("#ContentPri").hover(function(){
    $('#counterimage').attr('src', 'img/06.png');
    });
 } catch (e) { if (window.console !== undefined && window.console.log !== undefined) { window.console.log(e.message); } else { alert(e.message); } }
 
         
                                         
                                         
                                         
                                        ![Interactive visualization of a graph in python [closed]](https://www.devze.com/res/2023/04-10/09/92d32fe8c0d22fb96bd6f6e8b7d1f457.gif) 
                                         
                                         
                                         
                                         加载中,请稍侯......
 加载中,请稍侯......
      
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