javascript -- (點擊div,隨滑鼠移動)

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上載者:User

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涉及滑鼠三個事件:

onmousedown、onmousemove、onmouseup

<script type = "text/javascript">

  var body = document.getElementsByTagName(‘body‘)[0];

  //產生div,並設定其樣式

  var box = document.createElement(‘div‘);

  box.style.width = ‘100px‘;

  box.style.height = ‘100px‘;

  box.style.background = ‘blue‘;

  box.style.position = ‘absolute‘;

  box.onmousedown = function(event) {

    event = event || window.event;

    //擷取滑鼠點擊的位置距離div左邊的距離

    var positionX = event.clientX - box.offsetLeft;

    var positionY = event.clientY - box.offsetTop;

    document.onmousemove = function(event) {

       event = event || window.event;??

       var divX = event.clientX - positionX;

       var divY = event.clientY - positionY;

       box.style.left = divX + ‘px‘;

       box.style.top = divY + ‘px‘;

    }

    document.onmouseup = function() {

       document.onmousemove = null;

    }?  

  }

  body.appendChild(box);

</script>

javascript -- (點擊div,隨滑鼠移動)

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