// 消息全选
let checkAllTop = document.getElementById("checkAll")
// 消息列表对应的选择框
let checkbox = document.querySelectorAll(".message-wrapper ul input")

checkAllTop.onclick=function (){
    clickHandler()
}
// 点击消息全选
function clickHandler() {
    if (checkAllTop) {
        for (let i = 0; i < checkbox.length; i++) {
            let check = document.getElementById("check" + i);
            check.checked = checkAllTop.checked;
        }
        return;
    }
    checkAllTop.checked = true;
}

// 选择消息复选框，激活全选
for (let i = 0, j = checkbox.length; i < j; i++) {
    checkbox[i].onclick = function () {
        for (let j = 0; j < checkbox.length; j++) {
            let checks = document.getElementById("check" + j);
            if (!checks.checked) {
                checkAllTop.checked = false;
                return;
            } else {
                checkAllTop.checked = true;
            }
        }
    }
}