if 语句无法重新启用禁用的字段

Question

在禁用后重新启用字段时遇到问题

function disableDate() {
if (document.getElementById("ongoing").checked = true) {
document.getElementById("findate").disabled = true;
} else {
document.getElementById("findate").disabled = false;
}
}

<input id="ongoing" type="checkbox" name="educations'[ongoing]" onclick="disableDate()">
<input id="findate" type="text" name="educations[finish_date]" data-date-start-date="0" data-date-autoclose="true" data provide="datepicker" placeholder="Finish Date" />

Answer 1

=用于赋值，===用于比较

function disableDate() {
if(document.getElementById("ongoing").checked){
document.getElementById("findate").disabled = true;
}
else{
document.getElementById("findate").disabled = false;
}
}