TextInput should be given height
1TextInput should be given height, or it will not display in IOS.
2JavaScript substring( ) 方法
substring() 方法用於提取字串中介於兩個指定下標之間的字元。
substr() 方法可在字串中抽取從 start 下標開始的指定數目的字元。
註釋:substr() 的引數指定的是子串的開始位置和長度,因此它可以替代 substring() 和 slice() 來使用。
重要事項:ECMAscript 沒有對該方法進行標準化,因此反對使用它。
重要事項:在 IE 4 中,引數 start 的值無效。在這個 BUG 中,start 規定的是第 0 個字元的位置。在之後的版本中,此 BUG 已被修正。
3把頁面內容寫在return裡,否則是不會顯示什麼內容的
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