The filter filters vue

A, vue filter concepts

+ Concept: Vue.js allows you to customize filters, ** it may be used as some common text formatting **.
+ Filters can be used in two places: ** mustache interpolation and v-bind expression **.
+ Filter should be added at the end of the JavaScript expression, a "pipe" which is indicated;
+ done before output, the last layer of the packaging process.
+ For example: list | Filters

Second, the private filter

Private filters defined method: private local filter may only be used in the region of the current VM object View control

filters: { 
    // 在参数列表中 通过 pattern="" 来指定形参默认值，防止报错
    dataFormat(input, pattern = "") { 
      var dt = new Date(input);
      // 获取年月日
      var y = dt.getFullYear();
      var m = (dt.getMonth() + 1).toString().padStart(2, '0');
      var d = dt.getDate().toString().padStart(2, '0');

      // 如果 传递进来的字符串类型，转为小写之后，等于 yyyy-mm-dd，那么就返回 年-月-日
      // 否则，就返回  年-月-日 时：分：秒
      if (pattern.toLowerCase() === 'yyyy-mm-dd') {
        return `${y}-${m}-${d}`;
      } else {
        // 获取时分秒
        var hh = dt.getHours().toString().padStart(2, '0');
        var mm = dt.getMinutes().toString().padStart(2, '0');
        var ss = dt.getSeconds().toString().padStart(2, '0');
        return `${y}-${m}-${d} ${hh}:${mm}:${ss}`;
      }
    }
  }

HTML elements:

<td>{{item.ctime | dataFormat('yyyy-mm-dd')}}</td>

NOTE: complement digits: new approaches String.prototype.padStart ES6 the string (maxLength, fillString = '') or String.prototype.padEnd (maxLength, fillString = '' ) to fill the string;

Third, the global filters

Global: All vue can be used.

// 定义一个全局过滤器
Vue.filter('dataFormat', function (input, pattern = '') {
  var dt = new Date(input);
  // 获取年月日
  var y = dt.getFullYear();
  var m = (dt.getMonth() + 1).toString().padStart(2, '0');
  var d = dt.getDate().toString().padStart(2, '0');
  // 如果 传递进来的字符串类型，转为小写之后，等于 yyyy-mm-dd，那么就返回 年-月-日
  // 否则，就返回  年-月-日 时：分：秒
  if (pattern.toLowerCase() === 'yyyy-mm-dd') {
    return `${y}-${m}-${d}`;
  } else {
    // 获取时分秒
    var hh = dt.getHours().toString().padStart(2, '0');
    var mm = dt.getMinutes().toString().padStart(2, '0');
    var ss = dt.getSeconds().toString().padStart(2, '0');
    return `${y}-${m}-${d} ${hh}:${mm}:${ss}`;
  }
});

Note: When there are two local and global same name filter time, will be called to the principle of proximity, namely: local filter precedence over global filter is called!

The filter filters vue

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