If it is a function bound to an event handler function, the browser will pass a parameter by default, and this parameter is the event object.
= function() {
alert(); //1
}
Because using this parameter is more troublesome in this way, we can pass a parameter evt to use it.
= function(evt) {
var e = evt || ;
alert(); //0 is the left mouse button, 1 is the scroll wheel, and 2 is the right mouse button //Based on the upper left corner of the browser viewing area alert( + ',' + );
//The resolution of the machine alert( + ',' + );
// The position from the upper left corner of the screen alert( + ',' + );
}
//Detection button = function(evt) {
alert(getKey(evt));
}
function getKey(evt) {
var e = evt || ;
var keys = [];
if () {
('shift');
}
if () {
('ctrl');
}
if () {
('alt');
}
return keys;
}
//Keyboard event, keydown is to press any key, keyup is to bounce any key, keypress press character key trigger//Key code: Any key on the keyboard, fully compatible//Character encoding: keys of characters that can be output, IE is incompatible=function(evt){
var e = evt || ;
alert(); //keyCode returns the key code }
= function(evt) {
var e = evt || ;
alert(); //charCode returns character key code }
= function(evt) {
var e = evt || ;
alert(); // Select which element wherever you click target }
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