front end utils

front_end_utils.js

/**
 * 复制对象、数组
 * @param  {Object} obj [原始对象]
 * @return {Object}     [复制的对象]
 */
function clone(obj){
  var objClone;
  if (obj.constructor == Object){
    objClone = new obj.constructor();
  }else{
    objClone = [];
  }
  for(var key in obj){
    if ( objClone[key] != obj[key] ){
      if ( typeof(obj[key]) == 'object' ){
        objClone[key] = clone(obj[key]);
      }else{
        objClone[key] = obj[key];
      }
    }
  }
  return objClone;
}

/**
 * 模版替换
 * @param  {String} tpl    [模版, 中间的$tpl$是要被替换的]
 * @param  {Object} params [要替换的键值对]
 * @return {String}        
 */
function tplReplace(tpl, params){
  return tpl.replace(/\$.*?\$/g, function(data){
    return params[data];
  });
}

/**
 * 转换html特殊字符
 * @param  {String} res
 * @return {String}     
 */
function htmlEncode(res){
  return res.replace(/&/g, '&').
            replace(/</g, '&lt;').
            replace(/>/g, '&gt;').
            replace(/'/g, '&acute;').
            res.replace(/"/g, '&quot;').
            res.replace(/\|/g, '&brvbar;');
}

/**
 * 格式化日期显示，类似新浪微博的10秒前，1分钟前
 * @param  {Date} date     [要转换的日期]
 * @param  {Bool} friendly [是否转化成显示友好的（e.x:10秒前）]
 * @param  {Date} now      [系统标准时间]
 * @param  {Int} deepth    [深度，默认到分钟级别]
 * @return {String}          
 */
function dateFormat(date, friendly, now, deepth) {
    deepth = deepth || 2;
    var year = date.getFullYear();
    var month = date.getMonth() + 1;
    var day = date.getDate();
    var hour = date.getHours();
    var minute = date.getMinutes();
    var second = date.getSeconds();
    if (friendly && now && now.getTime() >= date.getTime()) {
    var mseconds = now.getTime() - date.getTime();
    var time_std = [ 1000, 60 * 1000, 60 * 60 * 1000, 24 * 60 * 60 * 1000 ];
    var display = ['秒前', '分钟前', '小时前'];
    for (var i=0; i!=deepth; ++i) {
      if (mseconds < time_std[i + 1]) {
      return Math.floor(mseconds / time_std[i]) + display[i];
      }
    }
    }
  
    hour = ((hour < 10) ? '0' : '') + hour;
    minute = ((minute < 10) ? '0' : '') + minute;
    second = ((second < 10) ? '0': '') + second;
    
    return year + '-' + month + '-' + day + ' ' + hour + ':' + minute;
  }