Cannot read property 'length' of undefined
照著寫 each section in sections.length > 0這段，出現(xiàn)Cannot read property 'length' of undefined這個問題，請問怎么解決
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照著寫 each section in sections.length > 0這段，出現(xiàn)Cannot read property 'length' of undefined這個問題，請問怎么解決
2015-04-27
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2015-12-16
sections未定義或者沒賦值。