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JS 中对象equals方法的实现

时间： 2021-07-31 作者：daque

上回咱们提出javascript 中浅正片与深正片的实行..这回咱们看看怎样实行确定两个对像的实质能否十分。这边有一个克隆截止规则是对准java谈话的,固然javascript也不妨独当一面。克隆满意的前提clone()本领将东西复制了一份并返还给挪用者。所谓“复制”的含意与clone()本领是如何实行的相关。普遍而言，clone()本领满意以次的刻画：第一、对任何的东西x，都有：x.clone() != x；换言之，克隆东西与原东西不是同一个东西。第二、对任何的东西x，都有：x.clone().getclass == x.getclass()，换言之，克隆东西与原东西的典型一律；在javascript getclass 就十分于constructor。第三、即使东西x的equals()本领是设置适合的话，那么 x.clone().equals(x)也该当是创造的。在java谈话的api中，但凡供给了clone()本领的类，都满意上头的那些那些前提。java谈话的安排师在安排本人的clone()本领是，也该当按照这三个前提。第三条为可选,不用强迫实行的,道理是说只有体例适合,也不妨实行。咱们还拿上回的例子看一下:运转代码框<html><head><title> new document </title><meta http-equiv="content-type" content="text/html; charset=utf8"><meta name="generator" content="wawa editor 1.0"><meta name="author" content="八神奄"><meta name="keywords" content="javascript,java,xml,xslt,asp,vbscript,asp .net,c#,c++,database"><meta name="description" content="不迭格的步调员,无所不在"></head><body><script language="javascript"></script></body></html> [ctrl+a 十足采用提醒：你可先窜改局部代码，再按运转]其它对像的equals 本领的样例:反面一个,我重设置了 boolean 结构因变量,并实行了它的tostirng()本领。不妨瞅瞅。运转代码框<html><head><title> new document </title><meta http-equiv="content-type" content="text/html; charset=utf8"><meta name="generator" content="wawa editor 1.0"><meta name="author" content="八神奄"><meta name="keywords" content="javascript,java,xml,xslt,asp,vbscript,asp .net,c#,c++,database"><meta name="description" content="不迭格的步调员,无所不在"></head><body>var a = new object(); a.arr = new array("a","b","c");a.name="a"; a.alert = function(){alert()}<br>var b = new object(); b.arr = new array("a","b"); b.name="a"; b.alert = function(){}<br>var str = new string("abc");<br>var str_1 = "abc";<br>var str_2 = "abd";<br>var c = a;<br>var d = b;<br><script language="javascript"><!--function object.prototype.equals(obj){if(this == obj)return true;if(typeof(obj)=="undefined"obj==nulltypeof(obj)!="object")return false;var length = 0; var length1=0;for(var ele in this) length++;for(var ele in obj) length1++;if(length!=length1) return false;if(obj.constructor==this.constructor){for(var ele in this){if(typeof(this[ele])=="object") {if(!this[ele].equals(obj[ele]))return false;}else if(typeof(this[ele])=="function"){if(!this[ele].tostring().equals(obj[ele].tostring())) return false;}else if(this[ele]!=obj[ele]) return false;}return true;}return false;}function string.prototype.equals(str){if(this==str)return true;return false;}function function.prototype.equals(func){if(this.tostring().equals(func.tostring()))return true;return false;}function boolean.prototype.equals(bool){if(this==bool)return true;if (bool instanceof boolean){ return this.tostring().equals(bool.tostring());} return false;}var a = new object();a.arr = new array("a","b","c");a.name="a"; a.alert = function(){alert()}var b = new object(); b.arr = new array("a","b");b.name="a";b.alert=function(){}var str = new string("abc");var str_1 = "abc";var str_2 = "abc";var c = a;var d = b;alert(" a.equals(b): "+a.equals(b)+"\n\n str.equals(str_1): "+str.equals(str_1)+"\n\n str_1.equals(str_2): "+str_1.equals(str_2)+"\n\n c.equals(a): "+a.equals(c)+"\n\n d.equals(b) : "+b.equals(d)+"\n\n a.alert.equals(b.alert): "+a.alert.equals(b.alert))</script><script language="javascript">function boolean(booleans){if(typeof(booleans)=="undefined"){this.value = false;return this;}else{if(booleans==null){this.value = false;return this;}if(booleans==""){this.value = false;return this;}if(!isnan(booleans)){if(booleans<=0){this.value = false;}else{this.value = true;}return this;}if(booleans!="true"){this.value = false;return this;}else{this.value = true;return this;}}} function boolean.prototype.tostring(){ return this.value ? "true" : "false" } document.writeln("两个布尔型对像的比拟截止:new boolean().equeals(new boolean(\"true\")): "+(new boolean().equals(new boolean("true"))));</script></body></html> [ctrl+a 十足采用提醒：你可先窜改局部代码，再按运转]

JS 中对象equals方法的实现

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