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fix(core): fix #978, should be able to clear onhandler added before zone.js #981
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fix #978.
The issue can be described as
zone.js
, add handler to onprop, such aselem.onload=function() {};
.zone.js
.elem.onload = null
.elem.onload
is not cleared.We need try to clear the
onprop
with the non-patched descriptor.