[js] 写一个方法把科学计数法转换成数字或者字符串 functionc(a) {returna.replace(/^(\d+)(?:.(\d+))*eE(\d+)/,(_,a,a1,p,n)=>{ a1=a1||''if(p==='-'&&n>0) {return'0.'+'0'.repeat(n-1)+a+a1 }else{returna+(a1.length>n? a1.substr(0, n)+'.'+a1.substr(n):...