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How JS extends String.prototype.format string splicing function

小云云
小云云Original
2018-03-12 09:05:491566browse

1、有关概念理解:String.prototype 属性表示 String原型对象。所有 String 的实例都继承自 String.prototype. 任何String.prototype上的改变都会影响到所有的 String 实例。本文主要和大家介绍了JS扩展String.prototype.format字符串拼接的功能,需要的朋友可以参考下,希望能帮助到大家。

2、上正文,js扩展String.prototype.format字符串拼接的功能,首先是基础功能的改造:


String.prototype.format = function(){
  if(arguments.length==0){
    return this;
  }
  for(var s=this, i=0; i

3、然后就是调用方式:


//方式1
var test = '我的{0}是{1}';
var result = test.format('id','城市之光');
//方式2
var test = '我的{name1}是{name2}';
var result = test.format({name1:'id',name2:'城市之光'});

4、就这么简单,附带一个对trim()的扩展


String.prototype.trim = function() { 
 return this.replace(/(^\s*)|(\s*$)/g, ""); 
};
String.prototype.ltrim = function() { 
 return this.replace(/(^\s*)/g, ""); 
};
String.prototype.rtrim = function() { 
 return this.replace(/(\s*$)/g, ""); 
};
//调用方式
var eg1 = $('#id').val().trim();

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