您可以重复document.styleSheets设置.style的.cssRules地方.selectorText比赛伪选择
let sheets = document.styleSheets;
let selector = "div::before";
let replacementContent = '"after"';
for (let sheet of sheets) {
for (let rule of sheet.cssRules) {
if (rule.selectorText === selector) {
rule.style["content"] = replacementContent;
}
}
}
div:before {
content: "before";
color: red;
font-weight: bold;
text-align: center;
text-shadow: 2px 2px 2px #000;
background: green;
width: 50px;
height: 50px;
display: block;
}
<div></div>
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