jQuery method to determine whether scroll bar exists

How jQuery determines whether a scroll bar exists: First create a front-end code sample file; then use jQuery to control the scroll bar scrolling; finally pass "if( $("body").scrollTop()>0) {...}else{...}" statement can be used to determine whether the scroll bar is offset.

#The operating environment of this tutorial: Windows 7 system, jquery1.10.0 version, thinkpad t480 computer.

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jQuery determines whether there is a scroll bar

Use jQuery to control the scroll bar scrolling, and then determine Whether the scroll bar is offset. If there is, the scroll bar exists, otherwise it does not exist without scrolling.

<script type="text/javascript">
$(function(){
    $("body").scrollTop(10);//控制滚动条下移10px
    if( $("body").scrollTop()>0 ){
        alert("有滚动条");
    }else{
        alert("没有滚动条");
    }
    $("body").scrollTop(0);//滚动条返回顶部
});
</script>

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