如何在没有扩展程序的情况下测量Chrome中的像素? [英] How can I measure pixels in Chrome without an extension?
问题描述
由于工作中的安全限制,不允许我安装Chrome扩展程序. Chrome在开发人员工具中内置了标尺,但是我不知道如何像标尺所允许的那样定义起点和终点.
Due to security limitations at work, I am not allowed to install Chrome extensions. Chrome has a ruler built in to the developer tools, but I can't figure out how to define start and end points like a ruler would permit.
是否有不需要安装Chrome扩展程序的用于测量像素的工具或技术?
Are there any tools or techniques for measuring pixels that don't require installing a Chrome extension?
推荐答案
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:
You could create your own ruler functionality and paste it into the console. Here's a basic example:
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;
});
您还可以将其另存为片段.
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并将其另存为摘要.不利之处在于代码可能会被压缩,并且依赖于浏览器中通常不具备的功能.
Chrome extension code is also just JavaScript, so you can find the code used by the extension and save that as a snippet. The downside here is that the code might be compressed, and rely on features that aren't normally available in the browser.
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