Vue中遍历数组的新方法

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1、foreach

foreach循环对不能使用return来停止循环

search(keyword){
var newList = []
this.urls.forEach(item =>{
if(item.name.indexOf(keyword) != -1){
newList.push(item)
}
})
return newList
}

2、filter

item对象就是遍历数组中的一个元素，includes是es6中的新方法，在search方法中直接返回新数组

search(keyword){
return this.urls.filter(item =>{
if(item.name.includes(keyword)){
return item
}
})
}

3、findIndex

返回true后index就可以获取到匹配的元素在进行删除

del(row){
this.$confirm("确定要删除吗？", "删除").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的循环

del(row){
this.$confirm("确定要删除吗？", "删除").then(action=>{
this.urls.some((item, i) =>{
if(item.name == row.name){
this.urls.splice(i, 1)
return true;
}
})
});
}

5、上例子，在一个vue的data中存入一个固定的数组，对数组进行遍历，实现搜索功能，删除功能

在el-table中 :data中绑定一个方法，方法中对固定的数组urls进行遍历，返回一个新的数组实现搜索功能

<template>
<div>
<label style="float: left;">
搜索关键字：
<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="网站名" prop="name" width="">
<template slot-scope="slot">
<a href="slot.row.url" target="_blank">{{slot.row.name}}</a>
</template>
</el-table-column>
<el-table-column label="网址" prop="url"></el-table-column>
<el-table-column label="类型" prop="type" width=""></el-table-column>
<el-table-column label="国家" prop="country" width=""></el-table-column>
<el-table-column label="操作" width="">
<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">批量删除</el-button>
</div>
</template><script>
export default {
data() {
return {
keyword:'',
selections: [],
urls: [{
name: "新浪",
url: "http://www.sina.com",
type: "资讯",
country: "中国"
},
{
name: "腾讯",
url: "http://www.tencent.com",
type: "聊天",
country: "中国"
},
{
name: "谷歌",
url: "http://www.google.com",
type: "资讯",
country: "美国"
},
{
name: "韬睿",
url: "http://www.51i-star.com",
type: "教育",
country: "中国"
}
]
};
},
methods: {
del(row){
this.$confirm("确定要删除吗？", "删除").then(action=>{
/* this.urls.some((item, i) =>{
if(item.name == row.name){
this.urls.splice(i, 1)
return true;
}
}) */
var index = this.urls.findIndex(item =>{
if(item.name == row.name){
return true;
}
})
this.urls.splice(index, )
});
},
select(selections, row) {
this.selections = selections;
},
batchDelete() {
this.$confirm("确定要删除吗？", "删除")
.then(action => {
for (var i = this.urls.length - ; i >= ; i--) {
for (var j = this.selections.length - ; j >= ; j--) {
if (this.urls[i].name == this.selections[j].name) {
this.urls.splice(i, );
break;
}
}
}
})
.catch(error => {
alert(error);
this.$message('删除取消');
});
},
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>