Delete text between <p> by javascript

I have the following HTML,two buttons and a paragraph code, and javascript, like the following:

// HTML
<input type="button" onclick="insert()" value="insert"开发者_JS百科/>
<input type="button" onclick="delete()" value="delete"/>
<p id='text'>
Line 1
Line 2
</p>

//javascript
function insert(){
  // ?
}

function delete(){
  // ?
}

When the user clicks the delete button, the Line 1 and Line 2 will be deleted.

When the user clicks the insert button, the Line 1 and Line 2 will be inserted.

The Line 1 and Line 2 will be only insert when they are not between the <p id='text'>.

Can anyone help me?

For insert(), how about

document.getElementById('text').innerHTML = 'Line 1\nLine 2';

and for delete(), how about

document.getElementById('text').innerHTML = '';

Please note that delete is a JavaScript keyword (and it's even actually implemented, which is more than I can say for the utterly excessive amount of reserved keywords that JavaScript has). You will need to name your delete() function something else.

With jQuery you can try:

$("#text").text('');

You could something quick and easy with jQuery... adding ids to your buttons.

$('#delete').click(function(){
    $('#text').html('');
})

$('#insert').click(function(){
    $('#text').html('Line 1 Line 2');
})

http://jsfiddle.net/jasongennaro/MTJxH/1/

function insert() {
    var para = document.getElementById("text");
    if(para.innerHTML === "") {
        para.innerHTML = "line1<br />line2";
    }
}
function remove() {
    document.getElementById("text").innerHTML = "";
}

However, please notice that I've changed the name of your delete function, because delete is a JavaScript keyword, and can't be used as the name of a function.

Here's a working example.

function insert() {
    var p = document.getElementById('text');
    if (p.innerHTML == '') {
        p.innerHTML = 'Line 1<br />Line 2';
    }
} 
function delete() {
    document.getElementById('text').innerHTML = '';
} 

function delete(){

        $('#text').html('');
    }

function insert(){
        if($('#text').text()=="")// add only if nothing inside
        {
        $('#text').html('Line 1 Line 2');
        }
    }

function delete()
{
    var delMe = document.getElementById('text');
    delMe.innerHTML = '';
}
function insert()
{
    var insMe = document.getElementById('text');
    insMe.innerHTML = "Line 1\r\nLine2";
}

Easy peasy.