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Regular verification

2022-04-22 06:43:00 【Bring in the red moon】

1. Verify positive and negative decimals （ monitor input Events and retain several decimal places ）

if(value){
  // Whether regular verification is positive or negative   With or without a decimal point 
  let reg = /^(-){1}$|[1-9]+(.\d+)?$|^-?0(\d+)?$|^-?[1-9]+[.0-9]*(.\d+)?$/;
  if (!reg.test(e.target.value)) {
	 console.log(" Please enter a number ")
   }
  // With  .  Intercepting string   The length exceeds 2  Determined not to be a number   Such as  1.2.3  It doesn't count 
  if (value.split('.').length>2) {
	 console.log(" Please enter a number ")
   }
  //  Judge how many decimal places to keep  
  if (value.split('.')[0].length>2) {
	 console.log(" Keep two decimal places ")
   }
}

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