“TypeError: Argument 1 of … is not a finite floating-point value” in Firefox

问题

I have a javascript code for clicking in mouse position (x/y)

var elem = document.elementFromPoint( cursorX,cursorY );

elem.addEventListener('click', function() {
    console.log('clicked')
}, false);

var support = true;

try {
    if (new MouseEvent('click', {bubbles: false}).bubbles !== false) {
        support = false;
    } else if (new MouseEvent('click', {bubbles: true}).bubbles !== true) {
        support = false;
    }
} catch (e) {
    support = false;
}
var cursorX;
var cursorY;
cursorX = 0; cursorY = 0;
document.onmousemove = function(e){
    cursorX = e.clientX;
   cursorY = e.clientY;
   elem = document.elementFromPoint(e.clientX, e.clientY);
}

It works correctly in chrome but not in firefox . when i put this code in firefox console , it says : TypeError: Argument 1 of Document.elementFromPoint is not a finite floating-point value.

what's this error ? and how can i fix this error ?

回答1:

TypeError: Argument 1 of ... is not a finite floating-point value. means that the function expects a number and you passed it something else.

To fix, you need to find the line this error was reported on, and check what the first argument to elementFromPoint() is (in this error message the arguments are numbered starting from 1).

If it's indeed not a number, fix that and the error will go away.

In your snippet, the very first line uses cursorX/cursorY, which are not initialized. If you use the same code when you get the error, that could be the reason.

回答2:

Can you try this?

document.onmousemove = function(e){
    cursorX = e.x || e.clientX;
    cursorY = e.y || e.clientY;
    elem = document.elementFromPoint(cursorX, cursorY);
}

回答3:

e might not be defined/passed as a parameter in Firefox it's often when dealing with events that people will also have

e = e || window.event;

stated in their function. perhaps this will fix your problem

来源：https://stackoverflow.com/questions/35968401/typeerror-argument-1-of-is-not-a-finite-floating-point-value-in-firefox

标签

javascript

firefox