Vue中遍曆數組的新方法

1、foreach

　　foreach迴圈對不能使用return來停止迴圈

1 search(keyword){
2         var newList = []
3         this.urls.forEach(item =>{
4           if(item.name.indexOf(keyword) != -1){
5             newList.push(item)
6           }
7         })
8         return newList
9       }

2、filter

　　item對象就是遍曆數組中的一個元素，includes是es6中的新方法，在search方法中直接返回新數組

1 search(keyword){
2         return this.urls.filter(item =>{
3           if(item.name.includes(keyword)){
4             return item
5        }
6    })
7 }

3、findIndex

　　返回true後index就可以獲取到匹配的元素在進行刪除

del(row){
          this.$confirm("確定要刪除嗎？", "刪除").then(action=>{
          var index = this.urls.findIndex(item =>{
            if(item.name == row.name){
              return true;
            }
          })
          this.urls.splice(index, 1)
});    

4、some

　　如果匹配成功就return true跳出some的迴圈

del(row){
        this.$confirm("確定要刪除嗎？", "刪除").then(action=>{
            this.urls.some((item, i) =>{
            if(item.name == row.name){
              this.urls.splice(i, 1)
              return true;
            }
          }) 
    });
}

5、上例子，在一個vue的data中存入一個固定的數組，對數組進行遍歷，實現搜索功能，刪除功能

　　在el-table中 :data中綁定一個方法，方法中對固定的數組urls進行遍歷，返回一個新的數組實現搜索功能

<template>
    <div>
     <label style="float: left;">
      搜索關鍵字：
      <input type="text" class="form-control" v-model="keyword">
    </label>
        <el-table :data="search(keyword)" size="small" :stripe="true" :border="true" @select="select" @select-all="select">
            <el-table-column type="selection"></el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="網站名" prop="name" width="200">
                <template slot-scope="slot">
                    <a href="slot.row.url" target="_blank">{{slot.row.name}}</a>
                </template>
            </el-table-column>
            <el-table-column label="網址" prop="url"></el-table-column>
            <el-table-column label="類型" prop="type" width="50"></el-table-column>
            <el-table-column label="國家" prop="country" width="50"></el-table-column>
            <el-table-column label="操作" width="50">
                <template slot-scope="slot">
                    <el-button size="mini" type="text" icon="el-icon-delete" @click="del(slot.row)"></el-button>
                </template>
            </el-table-column>
        </el-table>
        <el-divider content-position="left">表格操作</el-divider>
        <el-button @click="batchDelete" type="danger" icon="el-icon-delete" size="small">批量刪除</el-button>
    </div>
</template>

<script>
    export default {
        data() {
            return {
        keyword:'',
                selections: [],
                urls: [{
                        name: "新浪",
                        url: "http://www.sina.com",
                        type: "資訊",
                        country: "中國"
                    },
                    {
                        name: "騰訊",
                        url: "http://www.tencent.com",
                        type: "聊天",
                        country: "中國"
                    },
                    {
                        name: "谷歌",
                        url: "http://www.google.com",
                        type: "資訊",
                        country: "美國"
                    },
                    {
                        name: "韜睿",
                        url: "http://www.51i-star.com",
                        type: "教育",
                        country: "中國"
                    }
                ]
            };
        },
        methods: {
            del(row){
                this.$confirm("確定要刪除嗎？", "刪除").then(action=>{
          /* this.urls.some((item, i) =>{
            if(item.name == row.name){
              this.urls.splice(i, 1)
              return true;
            }
          }) */
          var index = this.urls.findIndex(item =>{
            if(item.name == row.name){
              return true;
            }
          })
          this.urls.splice(index, 1)
                });
            },
            select(selections, row) {
                this.selections = selections;
            },
            batchDelete() {
                this.$confirm("確定要刪除嗎？", "刪除")
                    .then(action => {
                        for (var i = this.urls.length - 1; i >= 0; i--) {
                            for (var j = this.selections.length - 1; j >= 0; j--) {
                                if (this.urls[i].name == this.selections[j].name) {
                                    this.urls.splice(i, 1);
                                    break;
                                }
                            }
                        }
                    })
                    .catch(error => {
                        alert(error);
                        this.$message('刪除取消');
                    });
            },
      search(keyword){
        /* var newList = []
        this.urls.forEach(item =>{
          if(item.name.indexOf(keyword) != -1){
            newList.push(item)
          }
        })
        return newList */
        return this.urls.filter(item =>{
          if(item.name.includes(keyword)){
            return item
          }
        })
      }

        }
    }
</script>

<style>

</style>

6、效果圖為