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[Java教程]javascript 简单实现对两个数组相似度的检验


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html ="http://www.w3.org/1999/xhtml" ="en"><head>  <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">  <title>js 检测两个数组是否相似</title></head><body>  <script>    //数组中的成员类型相同,顺序可以不同。例如[1, true] 与 [false, 2]是相似的。     //数组的长度一致。    //类型的判断范围,需要区分:String, Boolean, Number, undefined, null, 函数,日期, window.    function arraysSimilar(arr1, arr2){      //判断边界      if (!(arr1 instanceof Array) || !(arr2 instanceof Array)) {        return false;      }      //判断长度      if (arr1.length != arr2.length) return false;      var i = 0, n = arr1.length, countMap1 = {}, countMap2 = {}, t1, t2, TYPES = ['string', 'boolean', 'number', 'undefined', null, 'function', 'date', 'window'];      for ( ; i < n; i++) {        t1 = typeOf(arr1[i]);        t2 = typeOf(arr2[i]);        if (countMap1[t1]) {          countMap1[t1] ++;        }else{          countMap1[t1] = 1;        }        if (countMap2[t2]) {          countMap2[t2] ++;        }else{          countMap2[t2] = 1;        }      }      function typeOf(ele){        var r;        if (ele === null) r = 'null';        else if(ele instanceof Array) r = 'array';        else if(ele === window) r = 'window';        else if(ele instanceof Date) r = 'date';        else r = typeof ele;        return r;      }      for (i = 0; i < TYPES.length; i++) {        if (countMap1[TYPES[i]] != countMap2[TYPES[i]]) return false;      }      return true;    }    document.write(arraysSimilar([1,true], [false, 2]));  </script></body></html>

数组中的成员类型相同,顺序可以不同。例如[1, true] 与 [false, 2]是相似的数组的长度一致类型的判断范围,需要区分:String, Boolean, Number, undefined, null, 函数,日期, window.