var params = new URLSearchParams()
params.append("name","123")
params.append("age","111")
console.log(params.get("name")) //单个值
for(var value of params.values()) {
console.log(value); //遍历所有的值
}
for(var value of params.keys()) {
console.log(value); //遍历所有key 俩者是对应的
}
get("key")