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What are the common mistakes in the JavaScript comparison operator? most people do not understand the knowledge points of this article, so the editor summarizes the following contents, detailed contents, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this article, "what are the common mistakes in the JavaScript comparison operator?"

In a regular comparison, the data type is ignored, and the following if conditional statement returns true:

Varx=10

Vary= "10"

If (Xerox)

In a rigorous comparison operation, = is the identity operator, while checking the value and type of the expression, the following if conditional statement returns false:

Varx=10

Vary= "10"

If (x, x, y)

This error often occurs in switch statements, where switch statements use the identity operator (= =) to compare:

The following example executes the alert pop-up window:

Varx=10

Switch (x) {

Case10:alert ("Hello")

}

The following instance will not execute alert pop-up window due to type inconsistency:

Varx=10

Switch (x) {

Case "10": alert ("Hello")

}

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