Question

我正在尝试使用CSS Grid和jQuery，我被困在这里。我尝试按箭头键的方向展开框，我可以打印if ("color" in this.props && "size" in this.props && "shape" in this.props) { console.log('Received all props!'); } else { console.log('There are some missing props'); }，但它不会更新console.log值

＆＃13;

grid-column-start

＆＃13;

$(document).ready(function() {
  console.log("ready!");

  $(document).keypress(function(event) {
    console.log(("Key: " + event.which));
  });

  const box = {
    leftSide: $('.boxA').css('grid-column-start'),
    rightSide: $('.boxA').css('grid-column-end'),
    topSide: $('.boxA').css('grid-row-start'),
    bottomSide: $('.boxA').css('grid-row-start'),

    moveLeft: function() {
      if (this.leftSide > 1) {
        console.log(this.leftSide);
        $('.boxA').css('grid-row-start', function() {
          return box.leftSide - 1;
        });
      }
    }
  }

  $(document).keydown(function(e) {
    switch (e.which) {
      case 37:
        box.moveLeft();
        break;

      case 38: // up
        break;

      case 39: // right
        break;

      case 40: // down
        break;

      default:
        return; // exit this handler for other keys
    }
    e.preventDefault(); // prevent the default action (scroll / move caret)
  });
});

＆＃13;

.mediumboxes {
  width: 100vw;
  height: 100vh;
  background-color: blue;
  display: grid;
  grid-template-columns: repeat(20, 5%);
  grid-template-rows: repeat(10, 10%);
}

.boxA {
  display: block;
  grid-column-start: 2;
  grid-column-end: 3;
  grid-row-start: 1;
  grid-row-end: 2;
  background-color: red;
}

.boxB {
  display: block;
  grid-column: 2 / 3;
  grid-row: 1 / 11;
  background-color: orange;
}

＆＃13;

我想增加<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>的值，而不再在第10行再指定整个DOM路径leftSide。

是否可以仅提及$('boxA').css('grid-column-start', box.leftSide - 1)？

Answer 1

呀。只需this.leftSide = this.leftSide - 1;

您的代码似乎就像leftSide是一个函数一样。假设您将其更改为仅仅是一项任务，那么代码就没有任何问题。

见这里：http://jsbin.com/pacikas/2/edit?js,console

Jquery增加对象中CSS属性的值

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