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Summary of common javascript usage

Source: Internet
Author: User
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JS decoding and ipv.html
Copy codeThe Code is as follows:
<! DOCTYPE html>
<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Title> javascript encoding and decoding </title>
<Script type = "text/javascript">

Function gel (id ){
Return document. getElementById (id );
}

Window. onload = function (){
// Alert (document. getElementById ("span1"). innerHTML
Gel ("btn1"). onclick = function (){
Alert (encodeURI (gel ("span1"). innerHTML ));
};

Gel ("btn2"). onclick = function (){
Alert (decodeURI (gel ("span1"). innerHTML ));
};
};
</Script>
</Head>
<Body>
<Span id = "span1"> crazy guy! </Span>
<Input type = "button" id = "btn1" value = "encoded"/>
<Input type = "button" id = "btn2" value = "decoded"/>
</Body>
</Html>

Use of setintervaland settimeout.html in JS
Copy codeThe Code is as follows:
<! DOCTYPE html>
<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Title> Use of setInterval and setTimeout in js </title>
<Script type = "text/javascript">
Var time = 10;
Var id = 0;
Function gel (id ){
Return document. getElementById (id );
}

Function dectime (){
If (time> 0 ){
Time --;
Gel ("timespan"). innerHTML = time;
} Else {
// Clear the hour hand
ClearInterval (id );
}
}

Window. onload = function (){
Id = setInterval (dectime, 1000 );
};
</Script>
</Head>
<Body>
<Span> countdown <span id = "timespan" style = "color: red;"> </span> seconds </span>
</Body>
</Html>

JS check that the input field is a number. html
Copy codeThe Code is as follows:
<! DOCTYPE html>
<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Title> js check whether the input is a number </title>
<Script type = "text/javascript">



Window. onload = function (){
Document. getElementById ("btn1"). onclick = function (){
Var I = prompt ("Enter the value to be judged ");
// Window. alert (I );
If (! IsNaN (I )){
Window. alert ("Number ");
} Else {
Window. alert ("not a number ");
}
};
}
</Script>
</Head>
<Body>
<Input type = "button" id = "btn1" value = "Judge Number"/>
</Body>
</Html>

Create and delete node. html
Copy codeThe Code is as follows:
<! DOCTYPE html>
<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Title> js dynamic acquisition, creation, and deletion of nodes </title>
<Script type = "text/javascript">
Function gel (id) {return document. getElementById (id );}

Window. onload = function (){
Gel ("btnProAdd"). onclick = function (){
// Add a subnode under proList
Var linew = document. createElement ("li ");
Linew. innerHTML = prompt ("Enter the province to be added ");
Gel ("proList"). appendChild (linew );
// Rebind all click Delete events
DelLiOnClick ();
};

// Double-click the li subnode and delete it.

Function DelLiOnClick (){
// 1. obtain all the Child Nodes
Var liNodes = gel ("proList"). childNodes;

For (var I = 0; I <liNodes. length; I ++ ){
LiNodes [I]. onclick = function (){
// Alert (liNodes [I]). innerHTML; // because onclick is bound to an anonymous function, I will always be 7
// The following is the correct deletion method. Use this because the onclick event is always triggered by the li
This. parentNode. removeChild (this );
};
}
}


};
</Script>
</Head>
<Body>
<Ul id = "proList">
<Li> Shanxi </li>
<Li> Henan </li>
<Li> Beijing </li>
</Ul>

<Input type = "button" value = "add Province" id = "btnProAdd"/>
</Body>
</Html>

Use of setintervaland settimeout.html in JS

Copy codeThe Code is as follows:
<! DOCTYPE html>
<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Title> Use of setInterval and setTimeout in js </title>
<Script type = "text/javascript">
Var time = 10;
Var id = 0;
Function gel (id ){
Return document. getElementById (id );
}

Function dectime (){
If (time> 0 ){
Time --;
Gel ("timespan"). innerHTML = time;
} Else {
// Clear the hour hand
ClearInterval (id );
}
}

Window. onload = function (){
Id = setInterval (dectime, 1000 );
};
</Script>
</Head>
<Body>
<Span> countdown <span id = "timespan" style = "color: red;"> </span> seconds </span>
</Body>
</Html>

Jsdynamic topology table data .html
Copy codeThe Code is as follows:
<! DOCTYPE html>
<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Title> dynamically Add Table Data </title>

<Script type = "text/javascript">

Var mailArr = [
{"Title": "A c # question", "name": "Zhang San", "date "},
{"Title": "A javascript question", "name": "Li Si", "date "},
{"Title": "A c problem", "name": "5th", "date "},
{"Title": "A c ++ question", "name": "Zhao six", "date "}
];

Window. onload = function (){
Var tab = document. getElementById ("tb ");
// Add the mailArr looping Method to the table as tr
For (var rowindex = 0; rowindex <mailArr. length; rowindex ++ ){
Var tr = document. createElement ("tr ");
Var th1 = document. createElement ("th ");
Var 2nd = document. createElement ("th ");
Var th3 = document. createElement ("th ");
Var th4 = document. createElement ("th ");
Th1.innerHTML = "<input type = 'checkbox'/> ";
Th2.innerHTML = mailArr [rowindex]. title;
Th3.innerHTML = mailArr [rowindex]. name;
Th4.innerHTML = mailArr [rowindex]. date;

Tr. appendChild (th1 );
Tr. appendChild (2nd );
Tr. appendChild (th3 );
Tr. appendChild (th4 );

Tab. appendChild (tr );
}

};
</Script>

</Head>
<Body>
<Table id = "tb" border = "1px;" style = "border-collapse: collapse;">
<Tr>
<Th> sequence </th>
<Th> title </th>
<Th> mail sender </th>
<Th> sending time </th>
</Tr>
<! -- Add cyclically -->
</Table>
</Body>
</Html>

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