JS判断表单内容是否更改过

1,根据具体标签判断

function JudgesubmitForm() {
    var judjeWs = false;
    var judjeAt = false;
    var judjeWd = false;
    var ws = document.getElementById('WorkOrderStatusList');//下拉框
    var wsold = ws.options[ws.selectedIndex].value;
    var At = document.getElementById('AlarmHandleTypeList');//下拉框
    var Atold = At.options[At.selectedIndex].value;
    var wd = document.getElementById('OrderHandle');//输入框
    //At.options[At.selectedIndex].defaultSelectedif (wsold!="")
    {
        console.log("修改WS");
        judjeWs = true;
    }
    if (Atold != "") {
        console.log("修改AT");
        judjeAt = true;
    }
    if (wd.value != wd.defaultValue)
    {
        console.log("修改Wd");
        judjeWd = true;
    }
    if (judjeWs == true||judjeAt == true||judjeWd == true)
    {
        return true;
    }
    else
    {
        return false;
    }
}

2遍历所有的form标签

function JudgesubmitForm() {
    var form = document.getElementById('ImgForm');
    for (var i = 0; i < form.length; i++) {
        var element = form.elements[i];
        var type = element.type;
        if (type == "checkbox" || type == "radio") {

            if (element.checked == element.defaultChecked) {

                console.log("没有选择单选或多选框");
            }
        }
        if (type == "hidden" || type == "password" || type == "text" || type == "textarea") {

            if (element.value == element.defaultValue) {

                console.log("没有进行文本输入");
            }
        }

        if (type == "select-one" || type == "select-multiple") {

            for (var j = 0; j < element.options.length; j++) {

                if (element.options[j].selected == element.options[j].defaultSelected) {

                    console.log("没有选择下拉框");
                }
            }
        }
        if (type == "file") {
            if (element.value.length == 0) {
                Filechange = false;
                console.log("没选择图片");
            }
        }
    }