有没有办法使用Google App Scripts中的Logger.log记录对象的内容？
如果我有Logger.log(data)，则日志是＆＃39; DataTableBuilder＆＃39;或＆＃39;对象＆＃39;或类似的东西，令人难以置信的无益。
如果可能的话，我希望看到这些对象的JSON字符串......
答案 0 :(得分：4)
从Nov 2013开始，您可以使用JSON.stringify()将Objects转换为String。可以找到一些Google文档here，而完整的JavaScript方法文档可在您首选的API参考中找到，例如MDN。
使用示例：
Logger.log(JSON.stringify(obj, null, 2));
或者，通过Stackdriver Logging（从2017 June开始）：
console.log({message: "Interactive object serialization", theObject: obj})
// or
console.log(JSON.stringify(obj));
答案 1 :(得分：1)
这是我从another SO answer修改的函数：
var Log = {
// Thanks to Amos Batto - https://stackoverflow.com/questions/603987/what-is-the-javascript-equivalent-of-var-dump-or-print-r-in-php
/*
dump() displays the contents of a variable like var_dump() does in PHP. dump() is
better than typeof, because it can distinguish between array, null and object.
Parameters:
v: The variable
howDisplay: "none", "body", "alert" (default)
recursionLevel: Number of times the function has recursed when entering nested
objects or arrays. Each level of recursion adds extra space to the
output to indicate level. Set to 0 by default.
Return Value:
A string of the variable's contents
Limitations:
Can't pass an undefined variable to dump().
dump() can't distinguish between int and float.
dump() can't tell the original variable type of a member variable of an object.
These limitations can't be fixed because these are *features* of JS. However, dump()
*/
dump: function(functionName, v, recursionLevel) {
recursionLevel = (typeof recursionLevel !== 'number') ? 0 : recursionLevel;
var vType = typeof v;
var out = vType;
switch (vType) {
case "number":
/* there is absolutely no way in JS to distinguish 2 from 2.0
so 'number' is the best that you can do. The following doesn't work:
var er = /^[0-9]+$/;
if (!isNaN(v) && v % 1 === 0 && er.test(3.0))
out = 'int';*/
case "boolean":
out += ": " + v;
break;
case "string":
out += "(" + v.length + '): "' + v + '"';
break;
case "object":
//check if null
if (v === null) {
out = "null";
}
//If using jQuery: if ($.isArray(v))
//If using IE: if (isArray(v))
//this should work for all browsers according to the ECMAScript standard:
else if (Object.prototype.toString.call(v) === '[object Array]') {
out = 'array(' + v.length + '): {\n';
for (var i = 0; i < v.length; i++) {
out += repeatString(' ', recursionLevel) + " [" + i + "]: " +
Log.dump(functionName, v[i], recursionLevel + 1) + "\n";
}
out += repeatString(' ', recursionLevel) + "}";
}
else { //if object
sContents = "{\n";
cnt = 0;
for (var member in v) {
//No way to know the original data type of member, since JS
//always converts it to a string and no other way to parse objects.
sContents += repeatString(' ', recursionLevel) + " " + member +
": " + Log.dump(functionName, v[member], recursionLevel + 1) + "\n";
cnt++;
}
sContents += repeatString(' ', recursionLevel) + "}";
out += "(" + cnt + "): " + sContents;
}
break;
}
Logger.log(functionName + ' - ' + out);
return;
// Private Functions
// -----------------
/* repeatString() returns a string which has been repeated a set number of times */
function repeatString(str, num) {
out = '';
for (var i = 0; i < num; i++) {
out += str;
}
return out;
} // Log.dump.repeatString()
}, // Log.dump()
}
答案 2 :(得分：1)
我一直走到这个线程，寻找一种简洁的方法来记录GAS中的嵌套对象和数组。我需要这样的输出：
{
food : {
pizza : [
crust,
sauce,
topping,
cheese
]
},
drink : {
bananaShake : [
banana,
milk,
sugar
]
}
}
更新：这是一个更优雅的解决方案：Logger.log(JSON.stringify(obj, null, 2))。感谢@Zach在下面的评论。
无论如何，这是我之前使用的功能：
//-------------------------------------------------------------------------------
// Display the passed object in the Logger
// @param {object} obj - object to be logged
// @param {string} log - (for internal use only) final output sent to the logger
// @param {number} count - (for internal user only) keeps track of the number of
// iteration that the program is running in.
//-------------------------------------------------------------------------------
function logObj(obj, log, count) {
var def = {};
// Set default values to the passed arguments
obj = obj == undefined? def : obj;
log = log == undefined? '\n' : log;
count = count == undefined? 1 : count;
// If it's date object convert it to string
if(obj instanceof Date) {
obj = obj.toString();
}
// If it's a function represent it as a string
if(typeof obj == 'function') {
obj = 'function() {}';
}
// If it's an Object
if(typeof obj == 'object') {
var isArray = obj.constructor.name == 'Array';
var length = 0;
for(var i in obj) {
length++;
}
if(isArray) log += '[';
else log += '{';
if(length) {
log += '\n';
var num = 1;
for(var i in obj) {
// add tabs based on which iteration the program is running in
var tab1 = '';
var tab2 = ''; // this is one tab less than tab1
for(var k = 0; k < count; k++) {
tab1 += '\t';
if(k < (count - 1)) {
tab2 += '\t';
}
}
log += tab1;
if(!isArray) log += i + ' : ';
log += logObj(obj[i], '', count + 1);
if(num < length) {
log += ',\n';
}
num++;
}
log += '\n' + tab2;
}
if(isArray) log += ']';
else log += '}';
// if it's not the first iteration, return the log instead of printing it
if(count > 1) {
return log;
}
}
else if(count > 1) {
return obj;
}
else {
log = obj;
}
if(count == 1) {
Logger.log(log);
}
}