var mystr="Hello World!"
document.write(mystr.substring(mystr.indexOf("World!")) + "<br />");
document.write(mystr.substring(mystr.indexOf("Hello"),mystr.indexOf(" ",mystr.indexOf("Hello")+1)));
document.write(mystr.substring(mystr.indexOf("World!")) + "<br />");
document.write(mystr.substring(mystr.indexOf("Hello"),mystr.indexOf(" ",mystr.indexOf("Hello")+1)));
2020-07-10
document.write(mystr.indexOf("o",mystr.indexOf("o")+1));
2020-07-10
時分秒小于10，補零思路
var h=time.getHours();
var m=time.getMinutes();
var s=time.getSeconds();
if(h<10){
h="0"+h;
}
if(m<10){
m="0"+m;
}
if(s<10){
s="0"+s;
}
var h=time.getHours();
var m=time.getMinutes();
var s=time.getSeconds();
if(h<10){
h="0"+h;
}
if(m<10){
m="0"+m;
}
if(s<10){
s="0"+s;
}
2020-07-09
for (var i=0; i<Lists.length;i++)
{
var text= Lists[i].getAttribute("title");
if(text=="")
{
Lists[i].setAttribute("title","WED前端技術(shù)");
document.write(Lists[i].getAttribute("title")+"<br>");
}else{
document.write(text +"<br>");
}}
{
var text= Lists[i].getAttribute("title");
if(text=="")
{
Lists[i].setAttribute("title","WED前端技術(shù)");
document.write(Lists[i].getAttribute("title")+"<br>");
}else{
document.write(text +"<br>");
}}
2020-07-09
"小明:87;小花:81;小紅:97;小天:76;小張:74;小小:94;小西:90;小伍:76;小迪:64;小曼:76".split(';').map((e) => {
var result = e.split(':');
return { name: result[0], scroe: result[1] }
})
var result = e.split(':');
return { name: result[0], scroe: result[1] }
})
2020-07-01
"小明:87;小花:81;小紅:97;小天:76;小張:74;小小:94;小西:90;小伍:76;小迪:64;小曼:76".split(';')a.map((e) => {
var result = e.split(':');
return { name: result[0], scroe: result[1] }
})
var result = e.split(':');
return { name: result[0], scroe: result[1] }
})
2020-07-01
var otest = document.getElementById("test");
var node=otest.lastChild;
var newnode=document.createElement("li");
newnode.innerHTML="php";
otest.insertBefore(newnode,node);
var node=otest.lastChild;
var newnode=document.createElement("li");
newnode.innerHTML="php";
otest.insertBefore(newnode,node);
2020-06-29
var otest = document.getElementById("test");
var node = document.getElementsByTagName("li")[1];
var newnode = document.createElement("li");
newnode.innerHTML = "PHP";
otest.insertBefore(newnode,node);
var node = document.getElementsByTagName("li")[1];
var newnode = document.createElement("li");
newnode.innerHTML = "PHP";
otest.insertBefore(newnode,node);
2020-06-28
<div id="con"><p>javascript</p><div>jQuery</div><h5>PHP</h5></div>
var x=document.getElementById("con");
document.write
(
x.firstChild.nodeName + "<br/>"
);
document.write
(
x.lastChild.nodeName+"<br/>"
);
var x=document.getElementById("con");
document.write
(
x.firstChild.nodeName + "<br/>"
);
document.write
(
x.lastChild.nodeName+"<br/>"
);
2020-06-28
var con=document.getElementsByTagName("li");
for (var i=0; i< con.length;i++)
{
var text=con[i].getAttribute("title");
if(text!=null)
{
document.write(text+"<br>");
}
}
for (var i=0; i< con.length;i++)
{
var text=con[i].getAttribute("title");
if(text!=null)
{
document.write(text+"<br>");
}
}
2020-06-28
<input type="text" id="count" onfocus="startCount()"/>
<script type="text/javascript">
var num=0;
function startCount()
{
document.getElementById('count').value=num;
num=num+1;
setTimeout("startCount()",1000);
}
</script>
<script type="text/javascript">
var num=0;
function startCount()
{
document.getElementById('count').value=num;
num=num+1;
setTimeout("startCount()",1000);
}
</script>
2020-06-28