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The simplest JavaScript to verify integers, decimals, real numbers, significant decimal regular expressions_javascript skills

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2016-05-16 16:03:161183browse
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
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<title> 验证数字最简单正则表达式大全 </title> 
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<h3>输入完按回车后即可验证！（自认为最简单！）</h3> 
正整数:  <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^/d+$/.test(this.value));" /> 
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负整数:  <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-/d+$/.test(this.value));" /> 
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整　数:  <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-&#63;/d+$/.test(this.value));" /> 
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正小数:  <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^/d+/./d+$/.test(this.value));" /> 
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负小数:  <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-/d+/./d+$/.test(this.value));" /> 
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小　数:  <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-&#63;/d+/./d+$/.test(this.value));" /> 
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实　数:  <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-&#63;/d+(/./d+)&#63;$/.test(this.value));" /> 
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保留1位小数:<input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-&#63;/d+(/./d{1,1})&#63;$/.test(this.value));" /> 
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保留2位小数:<input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-&#63;/d+(/./d{1,2})&#63;$/.test(this.value));" /> 
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保留3位小数:<input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-&#63;/d+(/./d{1,3})&#63;$/.test(this.value));" /> 
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</body> 
</html>

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