Function checkrate (input) { var re =/^[0-9]+.? [0-9]*$/; Determines whether a string is a number//judgment positive integer/^[1-9]+[0-9]*]*$/ if (!re.test (input.rate.value)) { Alert ("Please enter a number (for example: 0.02)"); Input.rate.focus (); return false; } }
The following is a normal function to copy the code as follows: function Baseisnotnum (thenum) { //judge whether the number if (Basetrim (thenum) = "") return true; for (Var i=0;i<thenum.length;i++) { onenum=thenum.substring (i,i+1); if (onenum< "0" | | | onenum> "9") return true; } return false; } Function Baseisnotint (theint) { //To determine whether it is an integer Theint=basetrim (Theint); if (theint.length>1 && theint.substring (0,1) = = "0") | | Baseisnotnum (Theint)) { return true; } return false; } Function Baseisnotfloat (thefloat) { //determine if floating-point number Len=thefloat.length; Dotnum=0; if (len==0) return true; for (Var i=0;i<len;i++) { onenum=thefloat.substring (i,i+1); if (onenum==.) dotnum++; if ((onenum< "0" | | | onenum> "9") && onenum!= ".") | | DOTNUM>1) return true; } if (len>1 && thefloat.substring (0,1) = = "0") { if (thefloat.substring (1,2)!= ".") RetuRN true; } return false;
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