Introduction to the use of javascript practical small functions_javascript skills

1. Prevent the input of non-numbers, except for backspace

Copy code The code is as follows:

2. Limit the maximum input string length

Copy the code The code is as follows:

//Limit the maximum input length
var checkMaxL = function(length) {
var regC = /[^ - ~] /g;
var regE = /D /g;
var str = jQuery("#remark").val();

if (regC.test(str)){
jQuery("#remark").val(str.substring(0, length));
}

if(regE.test(str)){
jQuery("# remark").val(str.substring(0, length));
}
}