字符串 - String
1.查找字符串(indexOf)
```
def str = "Hello JsDroid!"
int index = str.indexOf("JsDroid")
print(index)
```
2.字符串切割(sbstring)
```
def str = "Hello JsDroid!"
str = str.substring(0,5)
print(str)
```
3.字符串替换(replace)
```
def str = "Hell1 JsDr1id!"
str = str.replace("1","o")
print(str)
```
4.判断字符串是否包含文字(contains)
```
def str = "Hello JsDroid!"
if (str.contains("JsDroid")){
print("包含JsDroid")
}
```
5.字符串转数字(toInteger)
```
def str = "666"
//输出字符串的类型
print "字符串类型："+str.class
def i = str.toInteger()
print "数字类型："+i.class
```
6.字符串切割(split)
```
def str = "hello,jsdroid"
def arr = str.split(",")
print(arr[0])
print(arr[1])
```
7.字符串数组拼接(join)
```
def arr = ["hello","jsdroid"]
print arr.join(",")
```
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