jquery select (list) operations (value/assignment)_jquery

1. Get the selected value: $("#xmzt option:selected").val() //xmzt is the id of

2. Set the selected item: $("select[@id=' pagesize_slt']")[0].selectedIndex = 1;//-----'s index starts from 0, so 1 is the second item

The strange thing is that I use id The value obtained should be the only value, but $("select[@id='pagesize_slt']").selectedIndex = 1; is incorrect. Must add [0]. In other words, $("select[@id='pagesize_slt']") actually returns an array. This needs attention.