rsHash static method
RS算法hash
str
字符串
返回 hash值
Implementation
static int rsHash(String str) {
var b = 378551;
var a = 63689;
var hash = 0;
for (var i = 0; i < str.length; i++) {
hash = hash * a + str.codeUnitAt(i);
a = a * b;
}
return hash & 0x7FFFFFFF;
}