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porque não inicia o JavaScript antes de mostrar o conteúdo WEB?

Rúben Periquito Developer

By Rúben Periquito Developer,
in Javascript

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Rúben Periquito Developer

Rúben Periquito Developer 3

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Posted

<!DOCTYPE html>
<html>
<head>
<title></title>


</script>
</head> 
<body>

    <h1>Title News</h1>
    <h2>These are today's news</h2>
    
    <div id="news1">Today's news are nothing special. Please come back tomorrow...</div>
    
<script type="text/javascript">    

var firstelement = document.getElementById("news1");

alert(firstelement);
    
    
</body>
</html>

 

Rúben Periquito 

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Rúben Periquito Developer

Rúben Periquito Developer 3

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1 hora atrás, Zex disse:

O " </script> " está em cima em vez de estar depois do "alert"

e aqui? 

<!DOCTYPE html>
<html>
<head>
<title></title>


</head> 
<body>

    <h1>Title News</h1>
    <h2>These are today's news</h2>
    
    <div id="news1">Today's news are nothing special. Please come back tomorrow...</div>
    
<script type="text/javascript">    

var parent = document.childNodes[0].childNodes[0];

alert(parent.nodeName);

</script>    
</body>
</html>

porque não aparece um alerta de Javascript com o nome do "filho"?

 

Rúben Periquito 

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M6

M6 149

Posted
Posted

A página é enviada ao browser e só quando este a recebe toda é que a começa a interpretar.
Só depois de estar estar pronta é que o Javascript é executado, tem a ver com o ciclo de vida do DOM.
Podes ler mais aqui: 

10 REM Generation 48K!
20 INPUT "URL:", A$
30 IF A$(1 TO 4) = "HTTP" THEN PRINT "400 Bad Request": GOTO 50
40 PRINT "404 Not Found"
50 PRINT "./M6 @ Portugal a Programar."

 

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Zex

Zex 8

Posted
Posted

o javascript funciona em qualquer lado  

 <!DOCTYPE html>
<html>
<head>
<title></title>


<script> 
var parent = document.childNodes[0];
alert(parent.nodeName+1);
</script>


<script type="text/javascript">

function run()
{    
var parent = document.childNodes[0];
alert(parent.nodeName+2);
}

</script> 

</head> 

<body onload="run()">

    <h1>Title News</h1>
    <h2>These are today's news</h2>
    
    <div id="news1">Today's news are nothing special. Please come back tomorrow...</div>
    
<script> 
var parent = document.childNodes[0];
alert(parent.nodeName+3);
</script>
 
  
</body>

<script> 
var parent = document.childNodes[0];
alert(parent.nodeName+4);
</script>
 
</html> 

<script> 
var parent = document.childNodes[0];
alert(parent.nodeName+5);
</script>

 

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