几个已知的问题

append="tree"不正常

append=tree 的bug

单位只能是px或者纯数字

Proposal- Support to use CSS units in Weex DSL

/**
 * the values below is valid
 * - number
 * - number + 'px'
 *
 * @param {string} v
 * @return {function} a function to return
 * - value: number|null
 * - reason(k, v, result)
 */
var LENGTH_VALIDATOR = function LENGTH_VALIDATOR(v) {
  v = (v || '').toString()
  var match = v.match(LENGTH_REGEXP)

  if (match) {
    var unit = match[1]
    if (!unit) {
      return {value: parseFloat(v)}
    }
    else if (SUPPORT_CSS_UNIT.indexOf(unit) > -1) {
      return {value: v}
    }
    else {
      return {
        value: parseFloat(v),
        reason: function reason(k, v, result) {
          return 'NOTE: unit `' + unit + '` is not supported and property value `' + v + '` is autofixed to `' + result + '`'
        }
      }
    }
  }

  return {
    value: null,
    reason: function reason(k, v, result) {
      return 'ERROR: property value `' + v + '` is not supported for `' + util.camelCaseToHyphened(k) + '` (only number and pixel values are supported)'
    }
  }
}

这个函数做了限制，放开的话要修改这个系统函数