vm.$once( event, callback )
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Arguments:
{String} event{Function} callback
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Usage:
Listen for a custom event, but only once. The listener will be removed once it triggers for the first time.
vm.$once()
2016-09-25 05:48:20
vm.$once( event, callback )
Arguments:
{String} event{Function} callbackUsage:
Listen for a custom event, but only once. The listener will be removed once it triggers for the first time.
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