The front end of the webpage filters the code through js illegal characters (swearing words, etc.)_javascript skills

var e = event || window.event
//Print character code
var code = e.charCode || e.keyCode;
//Return directly when the function key is pressed
if (e.charCode == 0) return true;
//ctr and alt return directly
if (e.ctrlKey || e.altKey) return true;
//ASCII character
if (code < 32) return true;
//Convert character code to character
var c = String.fromCharCode(code);
//Do not print if there are illegal characters
if (codes .indexOf(c) != -1) {
return false;
}
else {
return true;
}
}



Code 2 onchage (mainly used for processing when users paste), keyup event





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var codes = '<>/@#%';
//Illegal character array
var codearray = codes.split('');
// Loop to replace illegal characters
for (i = 0; i < codearray.length; i ) {
while (textvalue.indexOf(codearray[i]) != -1) {
textvalue = textvalue. replace(codearray[i], '');
}
}
//Reassign the value to the control
text.value = textvalue;
}



Usage example:





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