求大神帮忙看下input设置默认的value值无效

[qq_38975980]

<input id="customer-chat-login-mail" type="email" class="customer-chat-content-message-input-field" placeholder="[e-mail]" value="[e-mail]">

这个input只显示placeholder的值，value的值死活都不读，求大神看下下面的js，给指导下，谢谢了

function(t, e, i) {
    t.LoginFormView = Backbone.View.extend({
        events: {
            "click .select-department": "showDepartments"
        },
        mailExp: new RegExp("^[-+\\.0-9=a-z_]+@([-0-9a-z]+\\.)+([0-9a-z]){2,}$", "i"),
        nameValid: !1,
        mailValid: !1,
        initialize: function() {
            this.model = t.model.chat,
            this.selectDepartment = this.createSelectDepartmentView(),
            this.$form = this.$(".form"),
            this.$name = this.$("#customer-chat-login-name"),
            this.$mail = this.$("#customer-chat-login-mail"),
            this.$departmentsBtn = this.$(".select-department"),
            this.listenTo(this.selectDepartment, "updateSelection", this.onSelectDepartment),
            this.$name.on("input change keydown blur", e.proxy(this.validateName, this)),
            this.$mail.on("input change keydown blur", e.proxy(this.validateMail, this)),
            this.reset()
        },
        reset: function() {
            var t = this.model.departments;
            t && 0 !== t.length ? this.$departmentsBtn.parent().show() : this.$departmentsBtn.parent().hide(),
            this.$name.val(""),
            this.$mail.val(""),
            this.$name.removeClass("customer-chat-input-error"),
            this.$mail.removeClass("customer-chat-input-error"),
            "true" !== i.ui.askForMail && this.$mail.hide().val("[e-mail]")
        },
        validateDepartment: function() {
            var e = !1,
            i = this.model.departments;
            if (!i || 0 === i.length) return void(this.departmentValid = !0);
            if (this.selectDepartment.selected.length > 0 && (e = !0), e) {
                var s = _.findWhere(t.model.chat.departments, {
                    id: this.selectDepartment.selected[0]
                });
                this.$departmentsBtn.removeClass("customer-chat-input-error").addClass("selected").find(".empty-content").hide().end().find(".content").html(s.name).show(),
                this.departmentValid = !0
            } else this.$departmentsBtn.addClass("customer-chat-input-error").find(".empty-content").show().end().find(".content").hide(),
            this.departmentValid = !1
        },
        validateName: function() {
            0 == this.$name.val().length ? (this.$name.addClass("customer-chat-input-error"), this.nameValid = !1) : (this.$name.removeClass("customer-chat-input-error"), this.nameValid = !0)
        },
//怀疑是这里的问题！！！！
        validateMail: function() {
            0 != this.$mail.val().length && this.mailExp.test(this.$mail.val()) ? (this.$mail.removeClass("customer-chat-input-error"), this.mailValid = !0) : (this.$mail.addClass("customer-chat-input-error"), this.mailValid = !1)
        },
        isValid: function() {
            return this.validateDepartment(),
            this.validateName(),
            this.validateMail(),
            this.departmentValid && this.nameValid && this.mailValid
        },
        showDepartments: function() {
            this.$el.addClass("departments-view")
        },
        hideDepartments: function() {
            this.$el.removeClass("departments-view")
        },
        onSelectDepartment: function() {
            this.validateDepartment(),
            this.hideDepartments()
        },
        createSelectDepartmentView: function() {
            return new t.SelectListView({
                el: this.$(".departments .list"),
                model: this.model,
                single: !0,
                iconActive: "check",
                iconInactive: "circle",
                renderEvent: "departments:change",
                dataProvider: function() {
                    var e = t.model.chat.departments;
                    if (e) {
                        e = _.groupBy(e, "status");
                        var i = e.online || [],
                        s = e.offline || [];
                        return i.concat(s)
                    }
                    return []
                },
                getLabel: function(t) {
                    return "<div><span>" + t.name + "</span>" + (t.description ? "<em>" + t.description + "</em></div>": "")
                },
                styleItem: function(t, e, i) {
                    "offline" === t.data("entry").status ? t.removeClass("online").addClass("offline disabled") : t.removeClass("offline disabled").addClass("online")
                }
            })
        },
        getHeight: function() {
            return this.$form.height()
        }
    })
}

[上海程序员3]

直接 document.getElementById(”customer-chat-login-mail“).value="默认值" 这样子不行吗？