JS Simple set Drop-down selection box default value method _javascript Tips

The example of this article describes the JS simple set Drop-down selection box default value method. Share to everyone for your reference, specific as follows:

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function setselectoption (objselect, targetvalue) {
     if (objselect) {
      var options by default of the dropdown object) objselect.options;
      if (options) {
       var len = options.length;
       for (Var i=0;i<len;i++) {
        if (Options[i].value = = targetvalue) {
         options[i].defaultselected = true;
         Options[i].selected = true;
         return true;
        }
       }
      else {
       alert (' missing element (s)! ');
      }
    } else {
      alert (' missing element (s)! ')
;}

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