为什么第一段工作，第二段没有，两者都有来自脚本的相同调用 [英] Why first paragraph work and second no and both with the same call from script
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问题描述
<！DOCTYPE html>
< html>
< head>
< meta http-equiv =Content-Typecontent =text / html; charset = utf-8>
< title> Javascript Learning< / title>
< script type =text / javascript>
函数my（）{
var userName =Lister;
switch（userName）{
caseLister：
document.getElementById（bbref）。innerHTML =Lister Is the Man！;
休息;
caseRimmer：
document.getElementById（bbref）。innerHTML =Rimmer是一个Smeg头......;
休息;
默认值：
doacument.getElementById（bbref）。innerHTML =它全都是关于\Cat \
}
var x = document.cal。元素[0]。名称;
var y =jan;
document.write（x）;
switch（y）{
casejan：
document.getElementById（1）。innerHTML =1;
休息;
默认值：
document.write（sdffds）;
}
}
window.onload = my;
< / script>
< / head>
< body>
< h1 id =bbref>测试标题< / h1>
< h2 id =bbref> AAAAAA< / H2>
< / body>
< / html>
我尝试过：
两个段落与脚本相同的调用
解决方案
嗯，目前还不是很清楚你在说什么，但是。 ..doacument绝对错误：
doacument.getElementById（ bbref）。innerHTML = 这一切都是关于\The Cat \
试试
function my（）{
var userName =Lister;
var value ='';
switch（userName）{
caseLister：
value =Lister Is the Man！;
休息;
caseRimmer：
value =Rimmer是一个Smeg头......;
休息;
默认值：
value =这都是关于\Cat \;
}
var elems = document.querySelectorAll（'[id =bbref]'）;
for（var i = 0; i< elems.length; i ++）{
elems [i] .innerHTML = value;
}
}
或
<！DOCTYPE html>
< html>
< head>
< meta http-equiv =Content-Typecontent =text / html; charset = utf-8>
< title> Javascript Learning< / title>
< script type =text / javascript>
函数my（）{
var userName =Lister;
var value ='';
switch（userName）{
caseLister：
value =Lister Is the Man！;
休息;
caseRimmer：
value =Rimmer是一个Smeg头......;
休息;
默认值：
value =这都是关于\Cat \;
}
var elems = document.getElementsByClassName（'bbref'）;
for（var i = 0; i< elems.length; i ++）{
elems [i] .innerHTML = value;
}
}
window.onload = my;
< / script>
< / head>
< body>
< h1 id =bbrefclass =bbref>测试标题< / h1>
< h2 id =bbrefclass =bbref> AAAAAA< / H2>
< / body>
< / html>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Javascript Learning</title>
<script type="text/javascript">
function my(){
var userName = "Lister";
switch (userName) {
case "Lister" :
document.getElementById("bbref").innerHTML = "Lister Is the Man!";
break;
case "Rimmer":
document.getElementById("bbref").innerHTML = "Rimmer is a Smeg head...";
break;
default :
doacument.getElementById("bbref").innerHTML = "It's all about \"The Cat\""
}
var x = document.cal.elements[0].name;
var y = "jan";
document.write(x);
switch(y){
case "jan" :
document.getElementById("1").innerHTML="1";
break;
default :
document.write("sdffds");
}
}
window.onload = my;
</script>
</head>
<body>
<h1 id="bbref">Test Title</h1>
<h2 id="bbref"> aaaaaa</h2>
</body>
</html>
What I have tried:
the two paragraph with the same call from script
解决方案
Well, it's not very clear what you are talking about, but ...doacumentis definitely wrong:
doacument.getElementById("bbref").innerHTML = "It's all about \"The Cat\""
try
function my(){ var userName = "Lister"; var value = ''; switch (userName) { case "Lister" : value = "Lister Is the Man!"; break; case "Rimmer": value= "Rimmer is a Smeg head..."; break; default : value = "It's all about \"The Cat\""; } var elems = document.querySelectorAll('[id="bbref"]'); for (var i = 0; i < elems.length; i++) { elems[i].innerHTML = value; } }
or
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Javascript Learning</title> <script type="text/javascript"> function my() { var userName = "Lister"; var value = ''; switch (userName) { case "Lister": value = "Lister Is the Man!"; break; case "Rimmer": value = "Rimmer is a Smeg head..."; break; default: value = "It's all about \"The Cat\""; } var elems = document.getElementsByClassName('bbref'); for (var i = 0; i < elems.length; i++) { elems[i].innerHTML = value; } } window.onload = my; </script> </head> <body> <h1 id="bbref" class="bbref">Test Title</h1> <h2 id="bbref" class="bbref"> aaaaaa</h2> </body> </html>
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