<script type="text/javascript">
var arr = ['a', 'b', 'c']
try {
arr.forEach((item, index) => {
if (item === 'b') throw new Error('exist')
console.log(item)
})
} catch (e) {
//if (e.message == 'exist') throw e
} finally {
console.log('done')
}
</script>
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