[JavaScript知识库]js 倒计时60秒，亲测

var countdown=60;
function dx(val) {

    if (countdown == 0) {
        val.removeAttribute("disabled");
        val.value="获取验证码";
        countdown = 60;
    } else if(countdown == 60){
        $.modal.loading("正在获取验证码，请稍后...");
        var phone = $.common.trim($("input[name='phone']").val());
        $.ajax({
            type: "post",
            url: ctx + "dx",
            data: {
                "phone": phone
            },
            success: function(r) {
                $.modal.closeLoading();
                $.modal.msg(r.msg);
                if(r.code==0){
                    val.setAttribute("disabled", true);
                    val.value="重新发送(" + countdown + ")";
                    countdown--;
                    setTimeout(function() {
                        dx(val)
                    },1000)
                }
                //
            }
        });


    }else{
        val.setAttribute("disabled", true);
        val.value="重新发送(" + countdown + ")";
        countdown--;
        setTimeout(function() {
            dx(val)
        },1000)
    }

}

<input type="button" id="btn" value="获取验证码" onclick="dx(this)" />

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