利用不到200行代码写一款属于你自己的js类库

Xuery('#demo').on('click', function(e){ alert('hello world!')})

// 访问cssXuery('#demo').css('width')// 设置cssXuery('#demo').css('width', '1024px')// 设置cssXuery('#demo').css({ width: '1024px', height: '1024px'})

// 访问attrXuery('#demo').attr('title')// 设置attrXuery('#demo').attr('title', '1024px')// 设置attrsXuery('#demo').attr({ title: '1024px', name: '1024px'})

// 访问Xuery('#demo').html()// 设置Xuery('#demo').html('前端学习原生框架')

/** * 链模式实现自己的js类库 */(function(win, doc){ var Xuery = function(selector, context) {  return new Xuery.fn.init(selector, context) }; Xuery.fn = Xuery.prototype = { constructor: Xuery, init: function(selector, context) {  // 设置元素长度  this.length = 0;  // 默认获取元素的上下文document  context = context || document;  // id选择符，则按位非将-1转化为0  if(~selector.indexOf('#')) {  this[0] = document.getElementById(selector.slice(1));  this.length = 1;  }else{  // 在上下文中选择元素  var doms = context.getElementsByTagName(selector),  i = 0,  len = doms.length;  for(; i<len; i++){   this[i] = doms[i];  }  }  this.context = context;  this.selector = selector;  return this }, // 增强数组 push: [].push, sort: [].sort, splice: [].splice }; // 方法扩展 Xuery.extend = Xuery.fn.extend = function(){ // 扩展对象从第二个参数算起 var i = 1, len = arguments.length, target = arguments[0], j; if(i === len){  target = this;  i--; } // 将参数对象合并到target for(; i<len; i++){  for(j in arguments[i]){  target[j] = arguments[i][j];  } } return target } // 扩展事件方法 Xuery.fn.extend({ on: (function(){  if(document.addEventListener){  return function(type, fn){   var i = this.length -1;   for(; i>=0;i--){   this[i].addEventListener(type, fn, false)   }   return this  }  // ie浏览器dom2级事件  }else if(document.attachEvent){  return function(type, fn){   var i = this.length -1;   for(; i>=0;i--){   this[i].addEvent('on'+type, fn)   }   return this  }  // 不支持dom2的浏览器  }else{  return function(type, fn){   var i = this.length -1;   for(; i>=0;i--){   this[i]['on'+type] = fn;   }   return this  }  } })() }) // 将‘-'分割线转换为驼峰式 Xuery.extend({ camelCase: function(str){  return str.replace(//-(/w)/g, function(all, letter){  return letter.toUpperCase();  }) } }) // 设置css Xuery.extend({ css: function(){  var arg = arguments,  len = arg.length;  if(this.length < 1){  return this  }  if(len === 1) {  if(typeof arg[0] === 'string') {   if(this[0].currentStyle){   return this[0].currentStyle[arg[0]];   }else{   return getComputedStyle(this[0], false)[arg[0]]   }  }else if(typeof arg[0] === 'object'){   for(var i in arg[0]){   for(var j=this.length -1; j>=0; j--){    this[j].style[Xuery.camelCase(i)] = arg[0][i];   }   }  }  }else if(len === 2){  for(var j=this.length -1; j>=0; j--){   this[j].style[Xuery.camelCase(arg[0])] = arg[1];  }  }  return this } }) // 设置属性 Xuery.extend({ attr: function(){  var arg = arguments,  len = arg.length;  if(len <1){  return this  }  if(len === 1){  if(typeof arg[0] === 'string'){   return this[0].getAttribute(arg[0])  }else if(typeof arg[0] === 'object'){   for(var i in arg[0]){   for(var j=this.length -1; j>= 0; j--){    this[j].setAttribute(i, arg[0][i])   }   }  }  }  else if(len === 2){  for(var j=this.length -1; j>=0; j--){   this[j].setAttribute(arg[0], arg[1]);  }  }  return this } }) // 获取或者设置元素内容 Xuery.fn.extend({ html: function(){  var arg = arguments,  len = arg.length;  if(len === 0){  return this[0] && this[0].innerHTML  }else{  for(var i=this.length -1; i>=0; i--){   this[i].innerHTML = arg[0];  }  }  return this } }) Xuery.fn.init.prototype = Xuery.fn; window.Xuery = Xuery;})(window, document);