代码：
while let ampRange = self.rangeOfString("&", range: position ..< endIndex) {
result.extend(self[position ..< ampRange.startIndex])
position = ampRange.startIndex
出错：
/Users/crifan/dev/dev_root/daryun/JianDao/iOS-Client/JianDao/CrifanLib.swift:853:13: Value of type ‘String’ has no member ‘extend’
如图：
Value of type ‘String’ has no member ‘extend’
Value of type String has no member extend
Swift: Extending Array, Value of type _ has no member _ – Stack Overflow
ios – Error : Value of type ‘String’ has no member ‘URLByAppendingPathComponent’ – Stack Overflow
swift String extend
没有找到答案
后来在：
StringExtensionHTML on CocoaPods.org
－》StringExtensionHTML/StringExtensionHTML.swift at master · adela-chang/StringExtensionHTML
看到了：
result.appendContentsOf(self[position ..< ampRange.startIndex])
才知道：swift中之前的extend，现在换成了：appendContentsOf
然后改为：
while let ampRange = self.rangeOfString("&", range: position ..< endIndex) {
//result.extend(self[position ..< ampRange.startIndex])
result.appendContentsOf(self[position ..< ampRange.startIndex])
position = ampRange.startIndex
即可。
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