如何检查数组.在阵列中?jquery

how to check an array.. within an array? jquery

本文关键字：阵列 jquery 数组 何检查 检查      更新时间：2023-09-26

我想知道如何检查一个包含多个变量的数组…诸如此类。我可以用显示的代码更好地解释：

// Ignore the words in here, they are just there to explan.
var $array = [
  alpha = {
    name : $('.a'),
    date : $('.b'),
    street: $('.c')
  },
  beta = {
    name : $('.x'),
    date : $('.y'),
    street: $('.z')
  }      
];
/* So now I got this arrays.. withing an array? is that correct?
 * or what is this called?
 * and now I want to check each object's length, if its 0 -> return false and
 * throw out an error, if >= 1 go on and check the next. */
// Check if all needed elements for the toggle to work are existent 
$.each( $array, function(key, value) {
  if ( !value.length ) {
    alert("Could not find "+ '"' + value.selector +'"!')
    return false
  };
});
// Well obviously this doesnt work..

提前感谢！

您可以使用for (... in ...)循环遍历对象的属性名称：

/* since the array isn't a jQuery object, don't prefix the name with `$` */
var things = [
    /* array elements have integer, not string, indices. In any case, 
       "alpha = ..." is the wrong syntax to set properties. What it
       does is set a variable named "alpha".
     */
    {...},
    {...},
];
$.each(things, function(idx, item) {
  for (p in item) {
    if (! item[p].length) {
      /* alerts are disruptive; use other means of informing
         the user or developer.
       */
      //alert("Could not find "+ '"' + value.selector +'"!')
      return false;
    } /* blocks don't need semicolon separators */
  }
});

另请参阅"For..in loop？"

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