Question

我找到了用于绘制连接两个div的行的JavaScript代码： How to draw a line between two divs?

但是，当我尝试使用此代码绘制多行时，只有第一次调用connect（）函数似乎才有效，因为只显示一行。如何更改此代码以使其在多次使用connect（）函数时出现多行？

function getOffset( el ) {
var rect = el.getBoundingClientRect();
return {
    left: rect.left + window.pageXOffset,
    top: rect.top + window.pageYOffset,
    width: rect.width || el.offsetWidth,
    height: rect.height || el.offsetHeight
    };
}

function connect(div1, div2, color, thickness) { 
    var off1 = getOffset(div1);
    var off2 = getOffset(div2);
    // bottom right
    var x1 = off1.left + off1.width;
    var y1 = off1.top + off1.height;
    // top right
    var x2 = off2.left + off2.width;
    var y2 = off2.top;
    // distance
    var length = Math.sqrt(((x2-x1) * (x2-x1)) + ((y2-y1) * (y2-y1)));
    // center
    var cx = ((x1 + x2) / 2) - (length / 2);
    var cy = ((y1 + y2) / 2) - (thickness / 2);
    // angle
    var angle = Math.atan2((y1-y2),(x1-x2))*(180/Math.PI);
    // make hr
    var htmlLine = "<div style='padding:0px; margin:0px; height:" + thickness + "px; background-color:" + color + "; line-height:1px; position:absolute; left:" + cx + "px; top:" + cy + "px; width:" + length + "px; -moz-transform:rotate(" + angle + "deg); -webkit-transform:rotate(" + angle + "deg); -o-transform:rotate(" + angle + "deg); -ms-transform:rotate(" + angle + "deg); transform:rotate(" + angle + "deg);' />";
    body.innerHTML += htmlLine;
}

Answer 1

在调用connect（）

之前再次获取元素

window.testIt = function() {
  var div1 = document.getElementById('div1');
  var div2 = document.getElementById('div2');
  connect(div1, div2, "#0F0", 5);
  var div1 = document.getElementById('div1');
  var div3 = document.getElementById('div3');
  connect(div1, div3, "#0F0", 5); }

使用此代码时出现制作多个div的问题

1 个答案: