javascript之querySelector和querySelectorAll使用说明_javascript技巧

(function(global) {
global.doc = document;
global.body = doc.getElementsByTagName('body')[0];
global.$ = function(id) {
return doc.getElementById(id);
}

global.Logger = function(id) {
this.logElem = $(id);
this.logArr = [];
};
global.Logger.prototype = {
constructor: global.logger,

append: function(comment) {
this.logArr.push('

' + comment + '

');
},

flush: function() {
this.logElem.innerHTML = this.logArr.join('');
},

clear: function() {
this.logElem.innerHTML = '';
this.logArr = [];
}
};
})(this);

(function() {
var logger = new Logger('log');

var items = $('inner').querySelectorAll('#main h4.inside');
logger.append(items.length);

for(var i = 0, len = items.length; i logger.append(items[i].innerHTML);
}

logger.flush();
})();