将百分比转换为 html/javascript 中的小数
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Convert percent into a decimal in html/ javascript
提问by user1464427
Javascript:
Javascript：
var validate(s) = s.match ^( 100(?:\.0{1,2})? | 0*?\.\d{1,2} | \d{1,2}(?:\.\d {1,2})? )% $ != null;
var str = value.match(/\/\/%//g);
if(converted==NaN){
alert('Input was not a number');
}
else if(converted != null) {
var fracToDecimal = eval (value);
alert(fracToDecimal);
}
else if(converted = str) {
var percToDecimal = value/100;
alert(percToDecimal);
} }
回答by rfunduk
So you have a string like: 50%? How about:
所以，你有喜欢的字符串：50%？怎么样：
var percent = "50%";
var result = parseFloat(percent) / 100.0;
回答by Rocket Hazmat
If you use parseFloat, it will read the string up until the first non-number character (the %)
如果您使用parseFloat，它将读取字符串直到第一个非数字字符（%）
var x = '20.1%';
var y = parseFloat(x); // 20.1
Then you can check if it's NaN, and convert it.
然后你可以检查它是否是NaN，并转换它。
if(!isNaN(y)){
y /= 100; // .201
)
Note: You need to use isNaNbecause NaN === NaNis false(JavaScript is weird).
注意：您需要使用isNaN因为NaN === NaN是false（JavaScript 很奇怪）。
UPDATE: I see you also have fracToDecimalin there. You don't need evalfor that. Just do a simple split.
更新：我看到你也在fracToDecimal那里。你不需要eval那个。做一个简单的split.
var frac = '1/2';
var nums = frac.split('/');
var dec = nums[0]/nums[1];
回答by sparebytes
Assuming the "%" is on the right hand of the string, just use parseFloat(s)/100
假设“%”在字符串的右侧，只需使用 parseFloat(s)/100
