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var a="88px";
If the format is the same, the first parts are numbers and only the numbers need to be extracted, you can use:
parseInt(a);//88

Use regular rules

console.log('8px'.match(/(\d+)/)[0])

The first one can use the substring method: a.substring(0,a.length-2)
The second one can use regular expressions: var a='8px';a.replace(/px$/ig,'' )

var a = '8px';
a.slice(0,-2);

parseInt,parseFloat,slice,regexp

var str1 = "8px",
    str2 = "88px",
    str3 = "888px",
    str4 = "8.88px";
    
str1.replace(/(.*)px/, "$1"); //8
str2.replace(/(.*)px/, "$1"); //88
str3.replace(/(.*)px/, "$1"); //888
str4.replace(/(.*)px/, "$1"); //8.88

It is most convenient to use regular expressions

var reg = /([\d\.]+)px/; // 使用這個(gè)正則匹配
var arr = ['8px', '18px', '28px', '0.08px']
for (let i = 0, len = arr.length; i < len; i++) {
    console.log(arr[i], arr[i].match(reg)[1]);  // 結(jié)果arr[i].match(reg)[1]
}

I’m speechless for you guys, can’t I use parseInt, parseFloat