How to determine if there is a div in jquery

Jquery method to determine whether there is a div: 1. Use "if(document.getElementById('div')) {}" to determine whether the div element exists; 2. Use "if ($("#div ").length>0){}" method to determine whether the div element exists.

The operating environment of this tutorial: windows7 system, jquery1.10.0 version, Dell G3 computer.

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jquery determines whether there is a div element

1. Use javascript to determine whether the div element exists.

if(document.getElementById('div')) {
//code
} else {
//code
}

2. Use jquery to determine whether the div element exists.

if ($("#div").length > 0){ 
// 找到对应id=div的元素，然后执行此块代码 
}

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