jQuery判断网页元素是否存在

以id=abc为例

$(‘#abc’)不管页面上存不存在id=abc的元素,都会返回jQuery对象(详细内容可参照jQuery手册),因此我们就不能用if($(‘#abc’))来判断。

可以用

if($(“#abc”).size() > 0){}

if($(“#abc”).length > 0){}


( ! ) Warning: Missing argument 1 for cwppos_show_review(), called in /data/www/enjoyphp/wp-content/themes/flat/content-single.php on line 29 and defined in /data/www/enjoyphp/wp-content/plugins/wp-product-review/includes/legacy.php on line 18
Call Stack
#TimeMemoryFunctionLocation
10.0000355048{main}( ).../index.php:0
20.0001355336require( '/data/www/enjoyphp/wp-blog-header.php' ).../index.php:17
30.163810155632require_once( '/data/www/enjoyphp/wp-includes/template-loader.php' ).../wp-blog-header.php:19
40.165010226776include( '/data/www/enjoyphp/wp-content/themes/flat/single.php' ).../template-loader.php:74
50.243910785624get_template_part( ).../single.php:5
60.243910786144locate_template( ).../general-template.php:167
70.243910786240load_template( ).../template.php:643
80.244010786624require( '/data/www/enjoyphp/wp-content/themes/flat/content-single.php' ).../template.php:686
90.248510771360cwppos_show_review( ).../content-single.php:29

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