javascript – 单击按钮时停止启动功能

2023年5月27日 164次阅读

我有在另一个div内旋转div的功能.如何在按钮单击时启动和停止旋转div.一个按钮开始旋转另一个停止它.有没有办法只在我向右或向左滑动滑块而不是像现在鼠标移动时旋转div？请帮忙.旋转div的功能：

var img = $(".inner");

if (img.length > 0) {
  var offset = img.offset();

  function mouse(evt) {
    var center_x = (offset.left) + (img.width() / 2);
    var center_y = (offset.top) + (img.height() / 2);
    var mouse_x = evt.pageX;
    var mouse_y = evt.pageY;
    var radians = Math.atan2(mouse_x - center_x, mouse_y - center_y);
    var degree = (radians * (180 / Math.PI) * -1) + 90;
    img.css('-moz-transform', 'rotate(' + degree + 'deg)');
    img.css('-webkit-transform', 'rotate(' + degree + 'deg)');
    img.css('-o-transform', 'rotate(' + degree + 'deg)');
    img.css('-ms-transform', 'rotate(' + degree + 'deg)');
  }
  $(".inner").mousemove(mouse);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="inner" style="width:100px; height:100px; background-color:black; display:block; ">

最佳答案 您可以设置类来检测img是否已被点击：

自我点击版本：

var img = $(".inner");
var offset = img.offset();

function mouse(evt) {
  var center_x = (offset.left) + (img.width() / 2);
  var center_y = (offset.top) + (img.height() / 2);
  var mouse_x = evt.pageX;
  var mouse_y = evt.pageY;
  var radians = Math.atan2(mouse_x - center_x, mouse_y - center_y);
  var degree = (radians * (180 / Math.PI) * -1) + 90;
  img.css('-moz-transform', 'rotate(' + degree + 'deg)');
  img.css('-webkit-transform', 'rotate(' + degree + 'deg)');
  img.css('-o-transform', 'rotate(' + degree + 'deg)');
  img.css('-ms-transform', 'rotate(' + degree + 'deg)');
}

img.on('click', function(e) {

  $(this).toggleClass('clicked');

});

img.on('mousemove', function(evt) {
  if (!img.hasClass('clicked')) {
    mouse(evt);
  }
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="inner" style="width:100px; height:100px; background-color:black; display:block; ">

按钮单击版本：

var img = $(".inner");
var offset = img.offset();

function mouse(evt) {
  var center_x = (offset.left) + (img.width() / 2);
  var center_y = (offset.top) + (img.height() / 2);
  var mouse_x = evt.pageX;
  var mouse_y = evt.pageY;
  var radians = Math.atan2(mouse_x - center_x, mouse_y - center_y);
  var degree = (radians * (180 / Math.PI) * -1) + 90;
  img.css('-moz-transform', 'rotate(' + degree + 'deg)');
  img.css('-webkit-transform', 'rotate(' + degree + 'deg)');
  img.css('-o-transform', 'rotate(' + degree + 'deg)');
  img.css('-ms-transform', 'rotate(' + degree + 'deg)');
}

$('#Stop').on('click', function(e) {
  img.addClass('clicked');
});

$('#Start').on('click', function(e) {
  img.removeClass('clicked');
});

img.on('mousemove', function(evt) {
  if (!img.hasClass('clicked')) {
    mouse(evt);
  }
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="inner clicked" style="width:100px; height:100px; background-color:black; display:block; ">
</div>
<button id="Start">Start</button>
<button id="Stop">Stop</button>
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