Check if Object Array and ignore all else

This question already has an answer here:

Check if object is array? 38 answers

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You can use the isArray function from jQuery:

if (jQuery.isArray(specs)) {
   $overview.html('<div class="bullet_spec"></div>');
   jQuery.each(specs, function () {
       $overview.children('div').append('<ul class="specs"><li class="label">' + this.k + ' : ' + this.v + '</li></ul>');
   });
}

However, it appears the problem in your fiddle is that some of the elements ( x ) aren't even Json. So it's not that the result isn't an array, it's that it is unable to parse the result at all. You can simply wrap your parsing script with a try/catch to handle this gracefully:

var $overview = jQuery(this), spec;
try {
    specs = jQuery.parseJSON($overview.html());
} catch(e) {
    return;
}

Demonstartion

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这是用于检查数组无错误的常用代码和交叉浏览器代码：

if (Object.prototype.toString.call( someVar ) === '[object Array]' ) {

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