javascript中“==”和“===”区别
最近看书突然发现有在js中有===用法，上网查资料发现三个等是精确比较的意思，不仅值相同，还要类型相同。不说废话，直接上代码。
<html> <head> <title> ===和==区别 </title> </head> <body> <script type="text/javascript">var y = 5; if(y == "5"){ document.write("== '5' true"); } else{ document.write("== '5' false "); } document.write("</br>");if(y == 5){ document.write("== 5 数字 is true "); } else{ document.write("== 5 数字 false "); } document.write("</br>");if( y === 5){ document.write("=== 数字5 is true "); } else{ document.write("=== 数字5 false "); } document.write("</br>");if(y !== "5"){ document.write("!== '5' is true "); } else{ document.write("!== '5' is false"); } </script> </body></html>