<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>线性探测法处理碰撞的散列</title>
</head>
<body>
<p>线性探测法隶属于开放寻址散列。当发生碰撞时，检查散列中的下一个位置是否为空。如果为空就将数据存入该位置，不为空继续查下去。</p>
<p>如果数组的大小是待存储数据个数的1.5倍，那么使用开链法，如果是两倍及以上，使用线性探测法。</p>
<script>
function HashTable(){
this.table = new Array(137);
this.values = [];
this.betterHash = betterHash;
this.showDistro = showDistro;
this.put = put;
this.get = get;
} function betterHash(data){
const H =37;
var total = 0;
for(var i=0;i<data.length;i++){
total += H*total + data.charCodeAt(i); }
total %= this.table.length;
if(total <0){
total += this.table.length-1;
}
console.log(data+"->"+ total % this.table.length);
return parseInt(total);
}
function put(key,data){ //线性探测法
var pos = this.betterHash(key);
if(this.table[pos] == undefined){
this.table[pos] = key;
this.values[pos] = data;
}else{
while(this.table[pos] != undefined){
pos++;
}
this.table[pos] = key;
this.values[pos] = data;
}
console.log("values",this.values);
console.log("table",this.table);
}
function showDistro(){
for(var i = 0;i<this.table.length;i++){
if(this.table[i] != undefined){
console.log(this.table[i],":",this.table[i]);
}
}
}
function get(key){
var hash = this.betterHash(key);
if(hash >-1){
for(var i=hash;this.table[hash] != undefined;i++){
if(this.table[hash] == key){
return this.values[hash];
}
}
}
return undefined;
} var obj = new HashTable();
obj.put("k1","zhangsan");
obj.put("k2","lisi");
obj.put("k3","javascript");
obj.showDistro();
console.log(obj.get("k3"));
</script>
</body>
</html>