foo.js

function replaceAllLink() {
    var ruleMap = new Map(
        [
            ["link.zhihu.com/?target=", [
                "http://link.zhihu.com/?target=",
                "https://link.zhihu.com/?target="
            ]]
        ]
    )

    var as = document.getElementsByTagName("a");
    for (var i = 0; i < as.length; i++) {
        for (var rule of ruleMap) {
            if (as[i].href.indexOf(rule[0]) !== -1) {
                var h = as[i].href
                for (var replaceString of rule[1]) {
                    h = h.replace(replaceString)
                }
                as[i].href = decodeURIComponent(h)
            }
        }
    }
}