String.string 字符串

var string : static

Initializes a new instance of the String class to the value indicated by an array of Unicode characters,

初始化一个字符串类的新实例，由Unicode字符的数组给出的值。

a starting character position within that array, and a length. Represents the empty string. This field is read-only.

该数组内的起始字符位置，和一个长度。表示空字符串。这个域是只读的。