Breaking JavaScript execution always when cookie is set

问题

Is it possible to break javascript execution in FireBug (or in some other web developer tool) always when cookie is set (without setting JS breakpoints explicitly)?

document.cookie = '...';

Harri

回答1:

This should work (run it in a console):

origDescriptor = Object.getOwnPropertyDescriptor(HTMLDocument.prototype, 'cookie');
Object.defineProperty(document, 'cookie', {
  get() {
    return origDescriptor.get.call(this);
  },
  set(value) {
    debugger;
    return origDescriptor.set.call(this, value);
  },
  enumerable: true,
  configurable: true
});

回答2:

https://stackoverflow.com/a/41247745/2158271 does not seem to work in Chrome. Adding this snippet in the beginning of an html → head block works fine:

<script type="text/javascript">
    function debugAccess(obj, prop, debugGet){
        var origValue = obj[prop];
        Object.defineProperty(obj, prop, {
            get: function () {
                if ( debugGet )
                    debugger;
                return origValue;
            },
            set: function(val) {
                debugger;
                return origValue = val;
            }
        });
    };
    debugAccess(document, 'cookie');
</script>

See this Angular University page for more information.

回答3:

Try setting it in a If statement.

if(document.cookie.indexOf('...') >= 0){
  debugger;
}

note: when using firefox your console has to be open. in chrome this is not the case.

来源：https://stackoverflow.com/questions/41245885/breaking-javascript-execution-always-when-cookie-is-set