在javascript中将字符串转换为整数或浮点数 [英] Convert string to either integer or float in javascript
问题描述
如果我不知道变量是整数型还是十进制型,是否有一种简单的方法将字符串解析为整数或浮点型?
Is there a straightforward way to parse a string to either integer or float if I don't know if the variable is integer-number-like or decimal-number-like?
a = '2'; // => parse to integer
b = '2.1'; // => parse to float
c = '2.0'; // => parse to float
d = 'text'; // => don't parse
看来我的问题缺少必要的上下文:我想做一些计算而又不丢失原始格式(原始格式表示整数与浮点数.我不在乎原始的小数位数):
It seems my question lacked the necessary context: I want to do some calculations without losing the original format (Original format thereby means integer vs. float. I don't care about the original number of decimal places):
示例:
String containing the formatted number ('2')
=> parse to number (2.0)
=> do some calculations (2.0 + 1 = 3.0)
=> restore "original format" ('3' and not '3.0')
String containing the formatted number ('2')
=> parse to number (2.0)
=> do some calculations (2.0 + 1 = 3.0)
=> restore "original format" ('3' and not '3.0')
如果输入改为2.0,则所需结果将为"3.0"(而不是"3").
If the input was 2.0 instead, the wanted result would be '3.0' (not '3').
推荐答案
这就是我最终解决它的方式.除了将变量类型添加到变量之外,我没有找到其他解决方案...
That's how I finally solved it. I didn't find any other solution than to add the variable type to the variable ...
var obj = {
a: '2',
b: '2.1',
c: '2.0',
d: 'text'
};
// Explicitly remember the variable type
for (key in obj) {
var value = obj[key], type;
if ( isNaN(value) || value === "" ) {
type = "string";
}
else {
if (value.indexOf(".") === -1) {
type = "integer";
}
else {
type = "float";
}
value = +value; // Convert string to number
}
obj[key] = {
value: value,
type: type
};
}
document.write("<pre>" + JSON.stringify(obj, 0, 4) + "</pre>");
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