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根据 cookie 的 key 获取 value

// 获取cookie
function getCookie(key){var arrstr = document.cookie.split("; ");for (var i = 0; i < arrstr.length; i++){var temp = arrstr[i].split("=");if (temp[0] == key) return unescape(temp[1]);}return null
}// 调用 ----------------------------
let value = getCookie('token')
console.log(value)
// dasfdasgrbcvbx

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根据 xpath 获取页面元素

// 通过xpath获取页面元素的方法
function getElementsByXPath(xpath, parent) {let results = [];let query = document.evaluate(xpath, parent || document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);for (let i = 0, length = query.snapshotLength; i < length; ++i) {results.push(query.snapshotItem(i));}return results;
}// 调用 ----------------------------
// 从根节点下获取元素
let value = getElementsByXPath('//*[@class="abc"]')
console.log(value)
// [elm1, elm2, elm3 ... ]// 从某个元素节点下获取元素（从节点下获取记得xpath前要加个 “.” ，意思是从相对路径下获取）
let value = getElementsByXPath('.//*[@class="abc"]', elm)
console.log(value)
// [elm1, elm2, elm3 ... ] 

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ajax请求

fetch("http://127.0.0.1:8888/gt",{method: "GET",// credentials: "include",}
).then(res => res.json())
.then(res_json => {// 处理返回结果console.log(res_json )
})

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