Ⅰ js中xlsx.utils怎么拿到所有的行
参考这个方法：
var sheet2arr = function(sheet){
var result = [];
var row;
var rowNum;
var colNum;
var range = XLSX.utils.decode_range(sheet['!ref']);
for(rowNum = range.s.r; rowNum <= range.e.r; rowNum++){
row = [];
for(colNum=range.s.c; colNum<=range.e.c; colNum++){
var nextCell = sheet[
XLSX.utils.encode_cell({r: rowNum, c: colNum})
];
if( typeof nextCell === 'undefined' ){
row.push(void 0);
} else row.push(nextCell.w);
}
result.push(row);
}
return result;
};
Ⅱ 怎么使用github的js-xlsx库进行excel文件处理
JS-XLS
JS-XLS的安装是很简单的，在浏览器中使用该脚本文件，并使用脚本标记加载它：
<!-- https://github.com/SheetJS/js-xls/blob/master/xls.js -->
<script src="/path/to/xls.js"></script>
对于Node.js，只要通过NPM安装：
$ npm install xlsjs
$ node
> require('xlsjs').readFile('excel_file.xls');
然后，我们可以简单地使用他们提供的代码在他们的index.html文件解析和转换的xls文件JSON，CSV或公式为基础的输出。
function get_radio_value( radioName ) {
var radios = document.getElementsByName( radioName );
for( var i = 0; i < radios.length; i++ ) {
if( radios[i].checked ) {
return radios[i].value;
}
}
}
function to_json(workbook) {
var result = {};
workbook.SheetNames.forEach(function(sheetName) {
var roa = XLS.utils.sheet_to_row_object_array(workbook.Sheets[sheetName]);
if(roa.length > 0){
result[sheetName] = roa;
}
});
return result;
}
function to_csv(workbook) {
var result = [];
workbook.SheetNames.forEach(function(sheetName) {
var csv = XLS.utils.make_csv(workbook.Sheets[sheetName]);
if(csv.length > 0){
result.push("SHEET: " + sheetName);
result.push("");
result.push(csv);
}
});
return result.join("\n");
}
function to_formulae(workbook) {
var result = [];
workbook.SheetNames.forEach(function(sheetName) {
var formulae = XLS.utils.get_formulae(workbook.Sheets[sheetName]);
if(formulae.length > 0){
result.push("SHEET: " + sheetName);
result.push("");
result.push(formulae.join("\n"));
}
});
return result.join("\n");
}
var tarea = document.getElementById('b64data');
function b64it() {
var cfb = XLS.CFB.read(tarea.value, {type: 'base64'});
var wb = XLS.parse_xlscfb(cfb);
process_wb(wb);
}
function process_wb(wb) {
var output = "";
switch(get_radio_value("format")) {
case "json":
output = JSON.stringify(to_json(wb), 2, 2);
break;
case "form":
output = to_formulae(wb);
break;
default:
output = to_csv(wb);
}
if(out.innerText === undefined) out.textContent = output;
else out.innerText = output;
}
var drop = document.getElementById('drop');
function handleDrop(e) {
e.stopPropagation();
e.preventDefault();
var files = e.dataTransfer.files;
var i,f;
for (i = 0, f = files[i]; i != files.length; ++i) {
var reader = new FileReader();
var name = f.name;
reader.onload = function(e) {
var data = e.target.result;
var cfb = XLS.CFB.read(data, {type: 'binary'});
//var arr = String.fromCharCode.apply(null, new Uint8Array(data));
//var cfb = XLS.CFB.read(btoa(arr), {type: 'base64'});
var wb = XLS.parse_xlscfb(cfb);
process_wb(wb);
};
reader.readAsBinaryString(f);
//reader.readAsArrayBuffer(f);
}
}
function handleDragover(e) {
e.stopPropagation();
e.preventDefault();
e.dataTransfer.dropEffect = '';
}
if(drop.addEventListener) {
drop.addEventListener('dragenter', handleDragover, false);
drop.addEventListener('dragover', handleDragover, false);
drop.addEventListener('drop', handleDrop, false);
}
JS代码很容易理解，它使用了HTML5拖放API允许我们上传文件然后看他们为二进制字符串。二进制，然后直接传递到库，并进一步分析使用此代码：
var cfb = XLS.CFB.read(data, {type: 'binary'});
var wb = XLS.parse_xlscfb(cfb);
最终，WB（Workbook）对象是处理并转换成需要的格式（JSON，CSV和Excel公式）。这没有HTML5拖放文件阅读器的API，可用于Node.js代码相同。
注：此模块不支持xlsx。为了克服这一限制，我们可以通过同一作者称为JS-XLSX用另一个包。