例如：
"a"=="a"
$("#a").val().is("a")
当然可以自己写一个equals()方法
本js代码通过对js对象进行各方面的比较来判断两个对象是否相等cmp = function( x, y ) {
// If both x and y are null or undefined and exactly the same
if ( x === y ) {
return true
}
// If they are not strictly equal, they both need to be Objects
if ( ! ( x instanceof Object ) || ! ( y instanceof Object ) ) {
return false
}
//They must have the exact same prototype chain,the closest we can do is
//test the constructor.
if ( x.constructor !== y.constructor ) {
return false
}
for ( var p in x ) {
//Inherited properties were tested using x.constructor === y.constructor
if ( x.hasOwnProperty( p ) ) {
// Allows comparing x[ p ] and y[ p ] when set to undefined
if ( ! y.hasOwnProperty( p ) ) {
return false
}
// If they have the same strict value or identity then they are equal
if ( x[ p ] === y[ p ] ) {
continue
}
// Numbers, Strings, Functions, Booleans must be strictly equal
if ( typeof( x[ p ] ) !== "object" ) {
return false
}
// Objects and Arrays must be tested recursively
if ( ! Object.equals( x[ p ], y[ p ] ) ) {
return false
}
}
}
for ( p in y ) {
// allows x[ p ] to be set to undefined
if ( y.hasOwnProperty( p ) &&! x.hasOwnProperty( p ) ) {
return false
}
}
return true
}
使用：
objA={
a:'123',
b:'456'
}
objB={
a:'123',
b:'000'
}
var isEqual= cmp(objA, objB)
console.log(isEqual) // false 不相同
