javascript debug tips

debug javascript on mobile

tool: weinre

intecept native javascript function

something always happened on me is when the class of dom element changed, I don’t know how it was changed. I want to listen on the event when some attribute on the element changed. but this code is not written by me.

var original = Element.prototype.setAttribute;

Element.prototype.setAttribute = function(attr, value) {
	if(attr === 'the attribute you want to listen') {
		debugger;
	}
	original.call(this, attr, value);
}

this is a common skill in javascript to do aop