Javascript Drag & Drop Series Article 3 - Detailed Event Object Page 1/4_Javascript Skills

Before reading this article, you can first read the article "Javascript Drag & Drop Series Article 2: offsetLeft, offsetTop, offsetWidth, offsetHeight Properties" to clarify the context.
Okay, let’s get down to business.
The same attributes/methods of the model
1 Button attribute
Integer type, readable and writable. For a specific mouse event, it represents the pressed mouse button. It can determine whether the left mouse button triggers the mousedown event when dragging. All its values ​​​​and their meanings (referenced from "Javascript Advanced Programming") Okay, let's get to the point.
3.1 Properties/methods of e/window.Event object
3.1.1 IE event model and DOM events are as follows:
0-Button not pressed
1-Left button pressed
2 -Press the right button
3-Press the left and right buttons simultaneously
4-Press the middle button
5-Press the left button and the middle button
6-Press the right button and the middle button
7 Press the left, middle and right buttons simultaneously
The value returned by the button attribute of mouseup is exactly the same as that in the mousedown event.

Note: In all browsers compatible with the DOM event model, 0 means pressing the left button, the value 1 does not exist, 2 means pressing the right button, and for non-mouse events, "undefined" is returned.

2 clientX, clientY attributes
The types of these two attributes are Integer, the unit is pixel, and they are readable and writable. Respectively represent the x-coordinate and y-coordinate of the mouse in the client area of ​​the browser (excluding toolbars, scroll bars, etc.) when the relevant events occur. It’s best to explain it with a picture, please see:

Figure 3.1: clientX and clientY attributes

below The code is a very simple example. It can position the coordinates of the mouse at any time and display the results in two text boxes. If you like, you can try to run it. It is compatible with all modern browsers.

Sample code 1:

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BACKGROUND-COLOR: #f5f5f5"><br>    document.onmousemove</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">move;<br>    </span><span style="COLOR: #0000ff; BACKGROUND-COLOR: #f5f5f5">function</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"> move(e){<br>      </span><span style="COLOR: #0000ff; BACKGROUND-COLOR: #f5f5f5">if</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">(</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">!</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">e)<br>      {<br>        e</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">window.event;<br>      }<br>      </span><span style="COLOR: #0000ff; BACKGROUND-COLOR: #f5f5f5">var</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"> xElement</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">document.getElementById(</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">x</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">);<br>      </span><span style="COLOR: #0000ff; BACKGROUND-COLOR: #f5f5f5">var</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"> yElement</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">document.getElementById(</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">y</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">);<br>      xElement.value</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">e.clientX;<br>      yElement.value</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</span><span style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">e.clientY;<br><br>    }<br>    </span><span style="COLOR: #0000ff"><span style="COLOR: #800000">script</span><span style="COLOR: #0000ff">></span><span style="COLOR: #000000"><br>  </span><span style="COLOR: #0000ff"><span style="COLOR: #800000">head</span><span style="COLOR: #0000ff">></span><span style="COLOR: #000000"><br>  </span><span style="COLOR: #0000ff"><</span><span style="COLOR: #800000">body</span><span style="COLOR: #0000ff">></span><span style="COLOR: #000000"><br>  </span><span style="COLOR: #0000ff"><</span><span style="COLOR: #800000">input </span><span style="COLOR: #ff0000">type</span><span style="COLOR: #0000ff">="text"</span><span style="COLOR: #ff0000"> id</span><span style="COLOR: #0000ff">="x"</span><span style="COLOR: #ff0000"> value</span><span style="COLOR: #0000ff">=""</span><span style="COLOR: #ff0000"> </span><span style="COLOR: #0000ff">/></span><span style="COLOR: #000000"><br>  </span><span style="COLOR: #0000ff"><</span><span style="COLOR: #800000">input </span><span style="COLOR: #ff0000">type</span><span style="COLOR: #0000ff">="text"</span><span style="COLOR: #ff0000"> id</span><span style="COLOR: #0000ff">="y"</span><span style="COLOR: #ff0000"> value</span><span style="COLOR: #0000ff">=""</span><span style="COLOR: #ff0000"> </span><span style="COLOR: #0000ff">/></span><span style="COLOR: #000000"><br>  </span><span style="COLOR: #0000ff"><span style="COLOR: #800000">body</span><span style="COLOR: #0000ff">></span><span style="COLOR: #000000"><br></span><span style="COLOR: #0000ff"><span style="COLOR: #800000">html</span><span style="COLOR: #0000ff">><br><br><br><br><br><br><br></span>3 type属性<br><p class="pagenum tc"><br></p></span></span></span></span></span></span>