第一个input中value是123点击按钮使第一个input中value随机变换到其他三个input中j s

var input1 = document.getElementById("input1");
var input2 = document.getElementById("input2");
var input3 = document.getElementById("input3");
var input4 = document.getElementById("input4");

function changeValue() {
var randomNum = Math.floor(Math.random() * 3) + 2; //生成2-4之间的随机数
switch (randomNum) {
case 2:
input1.value = input2.value;
input2.value = "123";
break;
case 3:
input1.value = input3.value;
input3.value = "123";
break;
case 4:
input1.value = input4.value;
input4.value = "123";
break;
}
}

document.getElementById("btn").addEventListener("click", changeValue);