js截取字符串



function checkLen(obj) {

  var maxChars = 20;//最多字符数

  if (obj.value.length > maxChars)

   obj.value = obj.value.substring(0, maxChars);

  var curr = maxChars - obj.value.length;

  document.getElementByIdx_x("remark").innerHTML = curr.toString();

 }

easyui判断用户填写的属性值是否超出范围提示：

function strlen2(str){

  var len = 0;

  for (var i=0; i<str.length; i++) {

   var c = str.charCodeAt(i);

   if ((c >= 0x0001 && c <= 0x007e) || (0xff60<=c && c<=0xff9f)) {

    len++;

   }else {

    // 如果是中文则长度加3

    len+=3;

   }

  }

  return len;

 }

 var submitForm = function($dialog, $grid, $pjq) {

  var remark = $("#remark").val();

  if (strlen2(remark) > 50) {

   parent.$.messager.alert("提示", "角色备注过长！", "error");

   return;

  }