把一些常用的字符串hash算法做了一下封装
[js]代码：
// hash.js
exports.additive = function (key, prime) {
key = key instanceof Buffer ? key : new Buffer(key);
prime = prime == undefined ? 0xffffffff : prime;
for (var hash = key.length, i = 0; i < key.length; i++) {
hash += key[i];
}
return (hash % prime);
}
exports.rotating = function(key) {
key = key instanceof Buffer ? key : new Buffer(key);
for (var hash = key.length, i = 0; i> 28) ^ key[i];
}
return hash;
}
exports.bernstein = function(key, prime) {
key = key instanceof Buffer ? key : new Buffer(key);
prime = prime == undefined ? 0xffffffff : prime;
var hash = 0;
for (i=0; i> 7;
hash += hash << 3;
hash ^= hash >> 17;
hash += hash << 5;
return hash;
}
exports.fnv1a = function (key){
key = key instanceof Buffer ? key : new Buffer(key);
var p = 16777619, hash = 0x811C9DC5;
for(var i=0; i< key.length; i++) {
hash = (hash ^ key[i]) * p;
}
hash += hash << 13;
hash ^= hash >> 7;
hash += hash << 3;
hash ^= hash >> 17;
hash += hash << 5;
return hash;
}
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