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Using the onerror event to suppress JavaScript errors

Now that we know how to detect when an error has occurred (by using the onerror event), we can suppress them. Simply create a function that returns a value of "true", and attach this function to the onerror event. This function should appear at the very top, proceeding any other JavaScripts on the page. The following modifies the above example so the default error message is suppressed: 

<head>
<script type="text/javascript">
function errorsuppressor(){
return true
}
window.onerror=errorsuppressor
</script>

<script>
//invalid code below, although no errors will be generated
document.write('hi there'
</script>
</head>

Using the onerror event, along with a function that returns a value of true, any scripting error in a page will be suppressed.

Be careful when using the onerror event this way, since it only suppresses errors, but doesn't’t fix them. Even humans have trouble with the later! Whenever testing codes in your browser, make sure to first turn off the error suppressor , or you may even be fooled by your foul scripts!