How to determine whether jquery is equal

Jquery method to determine equality: 1. Use the "if (a==b && a==c && a==d) {}" method to determine; 2. Use "$(this). data("lastClick")" method can be used to realize the judgment.

The operating environment of this tutorial: windows7 system, jquery1.10.0 version. This method is suitable for all brands of computers.

Recommended: "jquery video tutorial"

Jquery method to determine whether they are equal:

Judge whether two strings are equal Equality:

Use identity (===) to judge (the value and type are consistent). If you use equality (==) to judge (the values ​​are consistent), there will be a misjudgment.

 var a = "1"; //字符串1
var b = 1; //数值1
var c = true; //布尔值1
var d = "1";
if (a==b && a==c && a==d) {
console.log('equality');
}

Judgement Whether two objects are equal:

html:
<a href="#" id="a">a</a>
<a href="#" id="b">b</a>
<script type="text/javascript">
$(function(){
$(&#39;#a&#39;).greenify();
});
</script>
js:
$.fn.greenify = function() {
    console.log(this.index());
    console.log($("#b").index());
    this.css( "color", "green" );
};

In this case, the first method can be judged by index().

The second method is to add a data attribute to the object for judgment.

$(this).data("lastClick")

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