1) When the method has no parameters, the value can be assigned directly using onclick = method name
window.onload = function() {
$('btnTest').onclick = test;
}
function test() {
alert(val);
}
2) When the method has parameters, it is wrong to use onclick = method name (parameter). You need to add function() in front of the method name
window.onload = function() {
$('btnTest').onclick = function( ) { test(1) };
}
function test(val) {
alert(val);
}
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
