<Button type="primary" @click="doIncludes()" style="margin-right: 8px;">验证是否包含</Button>

<Button type="primary" @click="doStartsWith()" style="margin-right: 8px;">验证是否某某开头</Button>

<Button type="primary" @click="doEndsWith()" style="margin-right: 8px;">验证是否某某结尾</Button>

<Button type="primary" @click="doPadStart()" style="margin-right: 8px;">字符串长度补全-前面补足</Button>

<Button type="primary" @click="doPadEnd()" style="margin-right: 8px;">字符串长度补全-结尾补足</Button>

<Button type="primary" @click="doTrimStart()" style="margin-right: 8px;">消除字符串开头空格</Button>

<Button type="primary" @click="doTrimEnd()" style="margin-right: 8px;">消除字符串结尾空格</Button>

doIncludes () {

      if (this.includeStr) {

        alert(this.sourceStr.includes(this.includeStr))

      } else {

        alert(false)

      }

    },

    doStartsWith () {

      if (this.includeStr) {

        alert(this.sourceStr.startsWith(this.includeStr))

      } else {

        alert(false)

      }

    },

    doEndsWith () {

      if (this.includeStr) {

        alert(this.sourceStr.endsWith(this.includeStr))

      } else {

        alert(false)

      }

    },

    doPadStart () {

      alert((this.padStr + '').padStart(2, 0))

    },

    doPadEnd () {

      alert((this.padStr + '').padEnd(2, 0))

    }