data mode, only first size is valid

[cuimingda]

template

<div class="card" v-for="product in products" :key="product.id">
  <img v-holder="holder">
  <!-- img v-holder="'img=100px200?auto=yes&random=yes&text=Full width'" -->
</div>

data config

holder: {
    img: '100px200',
    auto: 'yes'
    // theme: 'github',
    // random: 'yes',
    // textmode: 'exact'
},

first holder is 277200, and it's right. but the other holders are all 300300, only size is wrong, other config, like theme, random, textmode is all OK.

expect all sizes is 277*200 in this example.

btw, if change string mode, all is OK