<script>
function getQeuryVariable(variable) {
let query = window.location.search.substring(1)
console.log(query)
let vars = query.split('&')
for (let i = 0; i < vars.length; i++) {
let pair = vars[i].split('=')
console.log(pair)
if (pair[0] === variable) {
return pair[1]
}
}
return false
}
let userName = getQeuryVariable('userName')
console.log(userName)
</script>
url 例子： http://localhost:3000/index?userName=dev
调用 getQeuryVariable('userName') 返回用户名 dev
