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js/jquery method to obtain input focus of text box_javascript skills

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2016-05-16 16:57:291290browse

Method 1,

Copy the code The code is as follows:

function CheckForm() {
           if (document.form1.trainingName.value==""){
                                                                                                                                                                                                                                                          ; );
                                       return false; 🎜> Copy the code


The code is as follows:

function CheckForm() {
var classLevel = $("#classLevel").val(); var re = /^[1-9][0-9]*$/;
if(!re.test( classLevel)&&classLevel.length>0){                                     alert("Please enter an integer greater than zero!"); > } }
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