js makes the drop-down list box editable, not just selection_javascript skills

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<script> <br>function clearOption(obj,e){ <br>var currKey=0,e=e||event; <br>currKey=e.keyCode||e.which||e.charCode; <br>if(currKey == 8){ <br>obj. options[0].text = ""; <br>} <br>} <br>function writeSelect(obj,e){ <br>var currKey=0,e=e||event; <br>currKey=e .keyCode||e.which||e.charCode; <br>obj.options[0].selected = "select"; <br>if(currKey != 8){//This place is to avoid firefox again If annoying garbled characters appear, you can try commenting this sentence to see the effect in firefox <br>obj.options[0].text = obj.options[0].text String.fromCharCode(currKey); <br>} <br>e.returnValue=false; <br>return obj.options[0].text; <br>} <br>function ttt(){ <br>var jg = document.getElementById("aa") .options[document.getElementById("aa").selectedIndex].text; <br>//Of course, you can also set the value of options in the previous writeSelect function. In this case, you can directly use value to get it out in the program<br>jQuery("#aa").empty(); <br>jQuery("#aa").append("<option value=''></option>"); <br>} <br><br></script>

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