javascript 對象比較（hashcode）

javascript 對象的比較是比較坑爹的一件事，因為javascript對象比較的是引用地址！當兩個內容完全一樣的對象比較：

        var object1={
            name:"1234 ",
            code:123,
            test:"321",
        };
        var object2={
            name:"1234 ",
            code:123,
            test:"321",
        };
        console.log(object1==object2)   //false

解決方法使用hashcode

javascript hashcode實現

function hashcode(str) {
  var hash = 0, i, chr, len;
  if (str.length === 0) return hash;
  for (i = 0, len = str.length; i < len; i++) {
    chr   = str.charCodeAt(i);
    hash  = ((hash << 5) - hash) + chr;
     hash |= 0; // Convert to 32bit integer
 }
  return hash;
 }
 

實例：

        var object1={
            name:"1234 ",
            code:123,
            test:"321",
        };
        var object2={
            name:"1234 ",
            code:123,
            test:"321",
        };
        console.log(object1==object2)   //false
        var test1=hashcode(JSON.stringify(object1));
        var test2=hashcode(JSON.stringify(object2));
        console.log(test1,test2,test1==test2);