$(document).ready(function() {        var $cr = $("#cr");        var cr = $cr[0];        $cr.click(function() {        alert("click")            if (cr.checked) {                alert("thank you support,continue")            }        })    })        我同意条款

 jquery

$(document).ready(function() {        var $cr = $("#cr");                $cr.click(function() {                    if ($cr.is(":checked")) {                alert("thank you support,continue")            }        })    })