您可以创建自己的标尺功能并将其粘贴到控制台中。这是一个基本示例:
var fromX, fromY;
var svg = document.createElementNS ('http://www.w3.org/2000/svg',"svg");
svg.setAttribute("style", "position: absolute; top:0;left:0;height: " + document.body.clientHeight + "px;width: 100%");
var line = document.createElementNS('http://www.w3.org/2000/svg','line');
line.setAttribute("style", "stroke-width: 4; stroke: red");
svg.appendChild(line);
document.body.appendChild(svg);
document.body.addEventListener("mousedown", function (e) {
fromX = e.pageX;
fromY = e.pageY;
});
document.body.addEventListener("mousemove", function (e) {
if (fromX === undefined) {
return;
}
line.setAttribute("x1", fromX);
line.setAttribute("x2", e.pageX);
line.setAttribute("y1", fromY);
line.setAttribute("y2", e.pageY);
console.log(
[fromX, fromY], " to ", [e.pageX, e.pageY], "Distance:",
Math.sqrt(Math.pow(fromX - e.pageX, 2) + Math.pow(fromY - e.pageY, 2))
);
});
document.body.addEventListener("mouseup", function (e) {
fromX = undefined;
fromY = undefined;
});
您也可以将其另存为snippet https://developers.google.com/web/tools/chrome-devtools/debug/snippets/?hl=en.
Chrome 扩展程序代码也只是 JavaScript,因此您可以找到扩展程序使用的代码 https://stackoverflow.com/questions/14543896/where-does-chrome-store-extensions并将其另存为片段。这里的缺点是代码可能被压缩,并且依赖于浏览器中通常不可用的功能。