html代码如下:
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< select id = "category" name = "category" >
< option value = "" >请选择类别</ option >
< option value = "1" >类别1</ option >
< option value = "2" >类别2</ option >
< option value = "3" >类别3</ option >
< option value = "4" >类别4</ option >
</ select >
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js代码:
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<script type= "text/javascript" >
$( '#category option[value=3]' ).attr( 'selected' , true );
</script>
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