搭建react项目后:
首先 npm install xlsx; 此时报错,使用sudo npm install xlsx; password:输入您电脑的开机密码;
var tmpDown;
class A extends react.compoment(){
constructor(props){
super(props);
this.state={
href:''
}
}
下载模版:
downloadExl = (json,type) =>{
var tmpdata = json[0];
json.unshift({});
var keyMap = []; //获取keys
for (var k in tmpdata) {
keyMap.push(k);
json[0][k] = k;
}
var tmpdata = [];//用来保存转换好的json
json.map((v, i) => keyMap.map((k, j) => Object.assign({}, {
v: v[k],
position: (j > 25 ? this.getCharCol(j) : String.fromCharCode(65 + j)) + (i + 1)
}))).reduce((prev, next) => prev.concat(next)).forEach((v, i) => tmpdata[v.position] = {
v: v.v
});
var outputPos = Object.keys(tmpdata); //设置区域,比如表格从A1到D10
var tmpWB = {
SheetNames: ['mySheet'], //保存的表标题
Sheets: {
'mySheet': Object.assign({},
tmpdata, //内容
{
'!ref': outputPos[0] + ':' + outputPos[outputPos.length - 1] //设置填充区域
})
}
};
tmpDown = new Blob([this.s2ab(XLSX.write(tmpWB,
{bookType: (type == undefined ? 'xlsx':type),bookSST: false, type: 'binary'}//这里的数据是用来定义导出的格式类型
))], {
type: ""
}); //创建二进制对象写入转换好的字节流
var href = URL.createObjectURL(tmpDown); //创建对象超链接
this.state.href=href;
setTimeout(function() { //延时释放
URL.revokeObjectURL(tmpDown); //用URL.revokeObjectURL()来释放这个object URL
}, 100);
}
s2ab=(s)=> { //字符串转字符流
var buf = new ArrayBuffer(s.length);
var view = new Uint8Array(buf);
for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
return buf;
}
// 将指定的自然数转换为26进制表示。映射关系:[0-25] -> [A-Z]。
getCharCol=(n)=> {
let temCol = '',
s = '',
m = 0
while (n > 0) {
m = n % 26 + 1
s = String.fromCharCode(m + 64) + s
n = (n - m) / 26
}
return s
}
render(){
const {href} = this.state;
let obj = [{ //测试数据
"活动名称": "abcd活动",
"活动开始时间": "1/2/19",
"活动结束时间": "1/2/19",
"活动地点": "123",
"渠道": "自媒体",
"1月": "20.00",
"2月": "30.00",
"3月": "40.00",
"4月": "20.00",
"5月": "20.00",
"6月": "20.00",
"7月": "20.00",
"8月": "20.00",
"9月": "20.00",
"10月": "20.00",
"11月": "20.00",
"12月": "20.00"
}];
return {
<div>
<a href={href} download={'demo.xlsx'}>下载模版</a>
<button onClick={this.downloadExl(obj)}></button>
</div>
}
}
}
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