How does JavaScript change HTML style
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JavaScript: changing HTML styl
Changing the style of the HTML element is a variant that changes the HTML attribute.
Example
X=document.getElementById ("demo") / / find the element
X.style. Color = "# ff0000"; / / change the style
JavaScript: validating input
JavaScript is often used to validate a user's input.
Example
IfisNaN (x) {
Alert ("not number")
}
The above examples are just ordinary verification. If you want to use them in a production environment, you need to make a strict judgment. If you enter a space or a consecutive space isNaN, you can't tell it out. Rules can be added to determine:
Example
If (isNaN (x) | | x.replace (/ (^\ s*)) | (\ sroom$) / g, ") = =") {
Alert ("not number")
}
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